[gtk+] Adwaita: another stab at the undershoot

[Lapo Calamandrei <lapo src gnome org>]

commit fdc8c6103a2e11fa4e3ea292728190684932406b
Author: Lapo Calamandrei <calamandrei gmail com>
Date:   Wed Dec 17 19:42:11 2014 +0100

    Adwaita: another stab at the undershoot

 gtk/theme/Adwaita/_common.scss           |   92 ++++++++---------
 gtk/theme/Adwaita/_drawing.scss          |   44 ++++++++-
 gtk/theme/Adwaita/gtk-contained-dark.css |  162 +++++++++++++++---------------
 gtk/theme/Adwaita/gtk-contained.css      |  162 +++++++++++++++---------------
 4 files changed, 250 insertions(+), 210 deletions(-)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index ed8e57f..be8ba06 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -120,54 +120,6 @@ $ease-out-quad: cubic-bezier(0.25, 0.46, 0.45, 0.94);
   background-color: transparentize($selected_bg_color,0.8);
 }
 
-// This is used by GtkScrolledWindow, when content is touch-dragged past boundaries.
-.overshoot {
-  &.top {
-    @include overshoot(top);
-    &:backdrop { @include overshoot(top, backdrop); }
-  }
-  &.bottom {
-    @include overshoot(bottom);
-    &:backdrop { @include overshoot(bottom, backdrop); }
-  }
-  &.left {
-    @include overshoot(left);
-    &:backdrop { @include overshoot(left, backdrop); }
-  }
-  &.right {
-    @include overshoot(right);
-    &:backdrop { @include overshoot(right, backdrop); }
-  }
-}
-
-.undershoot {  //FIXME: make a mixin for the overshoot, special case the dark variant
-  &.top {
-    background: none;
-    background-image: linear-gradient(to bottom, transparentize(black, 0.7),
-                                                 transparentize(black, 0.9) 2px,
-                                                 transparent 10px);
-  } 
-  &.bottom {
-    background: none;
-    background-image: linear-gradient(to top, transparentize(black, 0.8),
-                                              transparentize(black, 0.95) 2px,
-                                              transparent 7px);
-  } 
-  &.left {
-    background: none;
-    background-image: linear-gradient(to right, transparentize(black, 0.8),
-                                                transparentize(black, 0.95) 2px,
-                                                transparent 7px);
-  } 
-  &.right {
-    background: none;
-    background-image: linear-gradient(to left, transparentize(black, 0.8),
-                                               transparentize(black, 0.95) 2px,
-                                               transparent 7px);
-  } 
-  &:backdrop { background-image: none; }
-}
-
 .label {
   &.separator {
     color: $fg_color;
@@ -3276,3 +3228,47 @@ GtkVolumeButton.button { padding: 8px; }
 .monospace {
   font: Monospace;
 }
+
+// This is used by GtkScrolledWindow, when content is touch-dragged past boundaries.
+.overshoot {
+  &.top {
+    @include overshoot(top);
+    &:backdrop { @include overshoot(top, backdrop); }
+  }
+  &.bottom {
+    @include overshoot(bottom);
+    &:backdrop { @include overshoot(bottom, backdrop); }
+  }
+  &.left {
+    @include overshoot(left);
+    &:backdrop { @include overshoot(left, backdrop); }
+  }
+  &.right {
+    @include overshoot(right);
+    &:backdrop { @include overshoot(right, backdrop); }
+  }
+}
+
+.undershoot {  //FIXME: the dark variant needs love
+  &.top {
+    @include undershoot(top);
+  }
+
+  &.bottom {
+    @include undershoot(bottom);
+  }
+
+  &.left {
+    @include undershoot(left);
+  }
+
+  &.right {
+    @include undershoot(right);
+  }
+
+  &.sidebar {
+    background-color: transparent; // otherwise it get inherited
+  }
+
+  &:backdrop { background-image: none; }
+}
diff --git a/gtk/theme/Adwaita/_drawing.scss b/gtk/theme/Adwaita/_drawing.scss
index 867662a..b8fa1d9 100644
--- a/gtk/theme/Adwaita/_drawing.scss
+++ b/gtk/theme/Adwaita/_drawing.scss
@@ -523,7 +523,7 @@
 
   @if $p==bottom {
     $_position: center bottom;
-    $_linear_gradient_direction: to top; 
+    $_linear_gradient_direction: to top;
   }
 
   @else if $p==right {
@@ -537,7 +537,7 @@
     $_small_gradient_size: $_small_gradient_length 100%;
     $_big_gradient_size: $_big_gradient_length 100%;
   }
-  
+
   $_small_gradient_color: $c;
   $_big_gradient_color: $c;
 
@@ -577,3 +577,43 @@
   border: none;                  //
   box-shadow: none;              //
 }
+
+ mixin undershoot($p) {
+//
+// undershoot
+//
+// $p: position
+//
+// possible $p values:
+// top, bottom, right, left
+//
+
+  $_shadow_color: if($variant == 'light', transparentize(black, 0.7), transparentize(black, 0.5));
+
+  background-color: transparent; // shouldn't be needed, but better to be sure;
+
+  @if $p==top {
+    background-image: linear-gradient(to bottom, $_shadow_color,
+                                                 transparentize($_shadow_color, 0.5) 3px,
+                                                 transparent);
+  }
+
+  @else if $p==bottom {
+
+    background-image: linear-gradient(to top, transparentize(black, 0.5),
+                                              transparentize(black, 0.8) 3%,
+                                              transparent,
+                                              transparentize(black, 0.98) 25%,
+                                              transparent);
+  }
+
+  @else {
+    $_dir: left;
+
+    @if $p==left { $_dir: right; }
+
+    background-image: linear-gradient(to $_dir, $_shadow_color,
+                                                transparentize($_shadow_color, 0.7) 2px,
+                                                transparent);
+  }
+}
diff --git a/gtk/theme/Adwaita/gtk-contained-dark.css b/gtk/theme/Adwaita/gtk-contained-dark.css
index 6c881a2..bebcee6 100644
--- a/gtk/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/theme/Adwaita/gtk-contained-dark.css
@@ -75,86 +75,6 @@
   border: 1px solid #215d9c;
   background-color: rgba(33, 93, 156, 0.2); }
 
-.overshoot.top {
-  background-image: -gtk-gradient(radial, center top, 0, center top, 0.5, to(#040404), to(rgba(4, 4, 4, 
0))), -gtk-gradient(radial, center top, 0, center top, 0.6, from(rgba(238, 238, 236, 0.07)), to(rgba(238, 
238, 236, 0)));
-  background-size: 100% 5%, 100% 100%;
-  background-repeat: no-repeat;
-  background-position: center top;
-  background-color: transparent;
-  border: none;
-  box-shadow: none; }
-  .overshoot.top:backdrop {
-    background-image: -gtk-gradient(radial, center top, 0, center top, 0.5, to(#1e2222), to(rgba(30, 34, 34, 
0)));
-    background-size: 100% 5%;
-    background-repeat: no-repeat;
-    background-position: center top;
-    background-color: transparent;
-    border: none;
-    box-shadow: none; }
-.overshoot.bottom {
-  background-image: -gtk-gradient(radial, center bottom, 0, center bottom, 0.5, to(#040404), to(rgba(4, 4, 
4, 0))), -gtk-gradient(radial, center bottom, 0, center bottom, 0.6, from(rgba(238, 238, 236, 0.07)), 
to(rgba(238, 238, 236, 0)));
-  background-size: 100% 5%, 100% 100%;
-  background-repeat: no-repeat;
-  background-position: center bottom;
-  background-color: transparent;
-  border: none;
-  box-shadow: none; }
-  .overshoot.bottom:backdrop {
-    background-image: -gtk-gradient(radial, center bottom, 0, center bottom, 0.5, to(#1e2222), to(rgba(30, 
34, 34, 0)));
-    background-size: 100% 5%;
-    background-repeat: no-repeat;
-    background-position: center bottom;
-    background-color: transparent;
-    border: none;
-    box-shadow: none; }
-.overshoot.left {
-  background-image: -gtk-gradient(radial, left center, 0, left center, 0.5, to(#040404), to(rgba(4, 4, 4, 
0))), -gtk-gradient(radial, left center, 0, left center, 0.6, from(rgba(238, 238, 236, 0.07)), to(rgba(238, 
238, 236, 0)));
-  background-size: 5% 100%, 100% 100%;
-  background-repeat: no-repeat;
-  background-position: left center;
-  background-color: transparent;
-  border: none;
-  box-shadow: none; }
-  .overshoot.left:backdrop {
-    background-image: -gtk-gradient(radial, left center, 0, left center, 0.5, to(#1e2222), to(rgba(30, 34, 
34, 0)));
-    background-size: 5% 100%;
-    background-repeat: no-repeat;
-    background-position: left center;
-    background-color: transparent;
-    border: none;
-    box-shadow: none; }
-.overshoot.right {
-  background-image: -gtk-gradient(radial, right center, 0, right center, 0.5, to(#040404), to(rgba(4, 4, 4, 
0))), -gtk-gradient(radial, right center, 0, right center, 0.6, from(rgba(238, 238, 236, 0.07)), to(rgba(238, 
238, 236, 0)));
-  background-size: 5% 100%, 100% 100%;
-  background-repeat: no-repeat;
-  background-position: right center;
-  background-color: transparent;
-  border: none;
-  box-shadow: none; }
-  .overshoot.right:backdrop {
-    background-image: -gtk-gradient(radial, right center, 0, right center, 0.5, to(#1e2222), to(rgba(30, 34, 
34, 0)));
-    background-size: 5% 100%;
-    background-repeat: no-repeat;
-    background-position: right center;
-    background-color: transparent;
-    border: none;
-    box-shadow: none; }
-
-.undershoot.top {
-  background: none;
-  background-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.1) 2px, transparent 
10px); }
-.undershoot.bottom {
-  background: none;
-  background-image: linear-gradient(to top, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.05) 2px, transparent 7px); }
-.undershoot.left {
-  background: none;
-  background-image: linear-gradient(to right, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.05) 2px, transparent 7px); 
}
-.undershoot.right {
-  background: none;
-  background-image: linear-gradient(to left, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.05) 2px, transparent 7px); }
-.undershoot:backdrop {
-  background-image: none; }
-
 .label.separator, GtkPlacesSidebar.sidebar .view .label.separator {
   color: #eeeeec; }
   .label.separator:backdrop, GtkPlacesSidebar.sidebar .view .label.separator:backdrop {
@@ -4424,6 +4344,88 @@ GtkVolumeButton.button, .header-bar GtkVolumeButton.button.titlebutton,
 .monospace {
   font: Monospace; }
 
+.overshoot.top {
+  background-image: -gtk-gradient(radial, center top, 0, center top, 0.5, to(#040404), to(rgba(4, 4, 4, 
0))), -gtk-gradient(radial, center top, 0, center top, 0.6, from(rgba(238, 238, 236, 0.07)), to(rgba(238, 
238, 236, 0)));
+  background-size: 100% 5%, 100% 100%;
+  background-repeat: no-repeat;
+  background-position: center top;
+  background-color: transparent;
+  border: none;
+  box-shadow: none; }
+  .overshoot.top:backdrop {
+    background-image: -gtk-gradient(radial, center top, 0, center top, 0.5, to(#1e2222), to(rgba(30, 34, 34, 
0)));
+    background-size: 100% 5%;
+    background-repeat: no-repeat;
+    background-position: center top;
+    background-color: transparent;
+    border: none;
+    box-shadow: none; }
+.overshoot.bottom {
+  background-image: -gtk-gradient(radial, center bottom, 0, center bottom, 0.5, to(#040404), to(rgba(4, 4, 
4, 0))), -gtk-gradient(radial, center bottom, 0, center bottom, 0.6, from(rgba(238, 238, 236, 0.07)), 
to(rgba(238, 238, 236, 0)));
+  background-size: 100% 5%, 100% 100%;
+  background-repeat: no-repeat;
+  background-position: center bottom;
+  background-color: transparent;
+  border: none;
+  box-shadow: none; }
+  .overshoot.bottom:backdrop {
+    background-image: -gtk-gradient(radial, center bottom, 0, center bottom, 0.5, to(#1e2222), to(rgba(30, 
34, 34, 0)));
+    background-size: 100% 5%;
+    background-repeat: no-repeat;
+    background-position: center bottom;
+    background-color: transparent;
+    border: none;
+    box-shadow: none; }
+.overshoot.left {
+  background-image: -gtk-gradient(radial, left center, 0, left center, 0.5, to(#040404), to(rgba(4, 4, 4, 
0))), -gtk-gradient(radial, left center, 0, left center, 0.6, from(rgba(238, 238, 236, 0.07)), to(rgba(238, 
238, 236, 0)));
+  background-size: 5% 100%, 100% 100%;
+  background-repeat: no-repeat;
+  background-position: left center;
+  background-color: transparent;
+  border: none;
+  box-shadow: none; }
+  .overshoot.left:backdrop {
+    background-image: -gtk-gradient(radial, left center, 0, left center, 0.5, to(#1e2222), to(rgba(30, 34, 
34, 0)));
+    background-size: 5% 100%;
+    background-repeat: no-repeat;
+    background-position: left center;
+    background-color: transparent;
+    border: none;
+    box-shadow: none; }
+.overshoot.right {
+  background-image: -gtk-gradient(radial, right center, 0, right center, 0.5, to(#040404), to(rgba(4, 4, 4, 
0))), -gtk-gradient(radial, right center, 0, right center, 0.6, from(rgba(238, 238, 236, 0.07)), to(rgba(238, 
238, 236, 0)));
+  background-size: 5% 100%, 100% 100%;
+  background-repeat: no-repeat;
+  background-position: right center;
+  background-color: transparent;
+  border: none;
+  box-shadow: none; }
+  .overshoot.right:backdrop {
+    background-image: -gtk-gradient(radial, right center, 0, right center, 0.5, to(#1e2222), to(rgba(30, 34, 
34, 0)));
+    background-size: 5% 100%;
+    background-repeat: no-repeat;
+    background-position: right center;
+    background-color: transparent;
+    border: none;
+    box-shadow: none; }
+
+.undershoot.top {
+  background-color: transparent;
+  background-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.5), transparent 3px, transparent); }
+.undershoot.bottom {
+  background-color: transparent;
+  background-image: linear-gradient(to top, rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.2) 3%, transparent, rgba(0, 
0, 0, 0.02) 25%, transparent); }
+.undershoot.left {
+  background-color: transparent;
+  background-image: linear-gradient(to right, rgba(0, 0, 0, 0.5), transparent 2px, transparent); }
+.undershoot.right {
+  background-color: transparent;
+  background-image: linear-gradient(to left, rgba(0, 0, 0, 0.5), transparent 2px, transparent); }
+.undershoot.sidebar {
+  background-color: transparent; }
+.undershoot:backdrop {
+  background-image: none; }
+
 /* GTK NAMED COLORS
    ----------------
    use responsibly! */
diff --git a/gtk/theme/Adwaita/gtk-contained.css b/gtk/theme/Adwaita/gtk-contained.css
index 3d0b9fe..7078d62 100644
--- a/gtk/theme/Adwaita/gtk-contained.css
+++ b/gtk/theme/Adwaita/gtk-contained.css
@@ -75,86 +75,6 @@
   border: 1px solid #4a90d9;
   background-color: rgba(74, 144, 217, 0.2); }
 
-.overshoot.top {
-  background-image: -gtk-gradient(radial, center top, 0, center top, 0.5, to(#878787), to(rgba(135, 135, 
135, 0))), -gtk-gradient(radial, center top, 0, center top, 0.6, from(rgba(46, 52, 54, 0.07)), to(rgba(46, 
52, 54, 0)));
-  background-size: 100% 5%, 100% 100%;
-  background-repeat: no-repeat;
-  background-position: center top;
-  background-color: transparent;
-  border: none;
-  box-shadow: none; }
-  .overshoot.top:backdrop {
-    background-image: -gtk-gradient(radial, center top, 0, center top, 0.5, to(#a8a8a8), to(rgba(168, 168, 
168, 0)));
-    background-size: 100% 5%;
-    background-repeat: no-repeat;
-    background-position: center top;
-    background-color: transparent;
-    border: none;
-    box-shadow: none; }
-.overshoot.bottom {
-  background-image: -gtk-gradient(radial, center bottom, 0, center bottom, 0.5, to(#878787), to(rgba(135, 
135, 135, 0))), -gtk-gradient(radial, center bottom, 0, center bottom, 0.6, from(rgba(46, 52, 54, 0.07)), 
to(rgba(46, 52, 54, 0)));
-  background-size: 100% 5%, 100% 100%;
-  background-repeat: no-repeat;
-  background-position: center bottom;
-  background-color: transparent;
-  border: none;
-  box-shadow: none; }
-  .overshoot.bottom:backdrop {
-    background-image: -gtk-gradient(radial, center bottom, 0, center bottom, 0.5, to(#a8a8a8), to(rgba(168, 
168, 168, 0)));
-    background-size: 100% 5%;
-    background-repeat: no-repeat;
-    background-position: center bottom;
-    background-color: transparent;
-    border: none;
-    box-shadow: none; }
-.overshoot.left {
-  background-image: -gtk-gradient(radial, left center, 0, left center, 0.5, to(#878787), to(rgba(135, 135, 
135, 0))), -gtk-gradient(radial, left center, 0, left center, 0.6, from(rgba(46, 52, 54, 0.07)), to(rgba(46, 
52, 54, 0)));
-  background-size: 5% 100%, 100% 100%;
-  background-repeat: no-repeat;
-  background-position: left center;
-  background-color: transparent;
-  border: none;
-  box-shadow: none; }
-  .overshoot.left:backdrop {
-    background-image: -gtk-gradient(radial, left center, 0, left center, 0.5, to(#a8a8a8), to(rgba(168, 168, 
168, 0)));
-    background-size: 5% 100%;
-    background-repeat: no-repeat;
-    background-position: left center;
-    background-color: transparent;
-    border: none;
-    box-shadow: none; }
-.overshoot.right {
-  background-image: -gtk-gradient(radial, right center, 0, right center, 0.5, to(#878787), to(rgba(135, 135, 
135, 0))), -gtk-gradient(radial, right center, 0, right center, 0.6, from(rgba(46, 52, 54, 0.07)), 
to(rgba(46, 52, 54, 0)));
-  background-size: 5% 100%, 100% 100%;
-  background-repeat: no-repeat;
-  background-position: right center;
-  background-color: transparent;
-  border: none;
-  box-shadow: none; }
-  .overshoot.right:backdrop {
-    background-image: -gtk-gradient(radial, right center, 0, right center, 0.5, to(#a8a8a8), to(rgba(168, 
168, 168, 0)));
-    background-size: 5% 100%;
-    background-repeat: no-repeat;
-    background-position: right center;
-    background-color: transparent;
-    border: none;
-    box-shadow: none; }
-
-.undershoot.top {
-  background: none;
-  background-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.1) 2px, transparent 
10px); }
-.undershoot.bottom {
-  background: none;
-  background-image: linear-gradient(to top, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.05) 2px, transparent 7px); }
-.undershoot.left {
-  background: none;
-  background-image: linear-gradient(to right, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.05) 2px, transparent 7px); 
}
-.undershoot.right {
-  background: none;
-  background-image: linear-gradient(to left, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.05) 2px, transparent 7px); }
-.undershoot:backdrop {
-  background-image: none; }
-
 .label.separator, GtkPlacesSidebar.sidebar .view .label.separator {
   color: #2e3436; }
   .label.separator:backdrop, GtkPlacesSidebar.sidebar .view .label.separator:backdrop {
@@ -4595,6 +4515,88 @@ GtkVolumeButton.button, .header-bar GtkVolumeButton.button.titlebutton,
 .monospace {
   font: Monospace; }
 
+.overshoot.top {
+  background-image: -gtk-gradient(radial, center top, 0, center top, 0.5, to(#878787), to(rgba(135, 135, 
135, 0))), -gtk-gradient(radial, center top, 0, center top, 0.6, from(rgba(46, 52, 54, 0.07)), to(rgba(46, 
52, 54, 0)));
+  background-size: 100% 5%, 100% 100%;
+  background-repeat: no-repeat;
+  background-position: center top;
+  background-color: transparent;
+  border: none;
+  box-shadow: none; }
+  .overshoot.top:backdrop {
+    background-image: -gtk-gradient(radial, center top, 0, center top, 0.5, to(#a8a8a8), to(rgba(168, 168, 
168, 0)));
+    background-size: 100% 5%;
+    background-repeat: no-repeat;
+    background-position: center top;
+    background-color: transparent;
+    border: none;
+    box-shadow: none; }
+.overshoot.bottom {
+  background-image: -gtk-gradient(radial, center bottom, 0, center bottom, 0.5, to(#878787), to(rgba(135, 
135, 135, 0))), -gtk-gradient(radial, center bottom, 0, center bottom, 0.6, from(rgba(46, 52, 54, 0.07)), 
to(rgba(46, 52, 54, 0)));
+  background-size: 100% 5%, 100% 100%;
+  background-repeat: no-repeat;
+  background-position: center bottom;
+  background-color: transparent;
+  border: none;
+  box-shadow: none; }
+  .overshoot.bottom:backdrop {
+    background-image: -gtk-gradient(radial, center bottom, 0, center bottom, 0.5, to(#a8a8a8), to(rgba(168, 
168, 168, 0)));
+    background-size: 100% 5%;
+    background-repeat: no-repeat;
+    background-position: center bottom;
+    background-color: transparent;
+    border: none;
+    box-shadow: none; }
+.overshoot.left {
+  background-image: -gtk-gradient(radial, left center, 0, left center, 0.5, to(#878787), to(rgba(135, 135, 
135, 0))), -gtk-gradient(radial, left center, 0, left center, 0.6, from(rgba(46, 52, 54, 0.07)), to(rgba(46, 
52, 54, 0)));
+  background-size: 5% 100%, 100% 100%;
+  background-repeat: no-repeat;
+  background-position: left center;
+  background-color: transparent;
+  border: none;
+  box-shadow: none; }
+  .overshoot.left:backdrop {
+    background-image: -gtk-gradient(radial, left center, 0, left center, 0.5, to(#a8a8a8), to(rgba(168, 168, 
168, 0)));
+    background-size: 5% 100%;
+    background-repeat: no-repeat;
+    background-position: left center;
+    background-color: transparent;
+    border: none;
+    box-shadow: none; }
+.overshoot.right {
+  background-image: -gtk-gradient(radial, right center, 0, right center, 0.5, to(#878787), to(rgba(135, 135, 
135, 0))), -gtk-gradient(radial, right center, 0, right center, 0.6, from(rgba(46, 52, 54, 0.07)), 
to(rgba(46, 52, 54, 0)));
+  background-size: 5% 100%, 100% 100%;
+  background-repeat: no-repeat;
+  background-position: right center;
+  background-color: transparent;
+  border: none;
+  box-shadow: none; }
+  .overshoot.right:backdrop {
+    background-image: -gtk-gradient(radial, right center, 0, right center, 0.5, to(#a8a8a8), to(rgba(168, 
168, 168, 0)));
+    background-size: 5% 100%;
+    background-repeat: no-repeat;
+    background-position: right center;
+    background-color: transparent;
+    border: none;
+    box-shadow: none; }
+
+.undershoot.top {
+  background-color: transparent;
+  background-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.3), transparent 3px, transparent); }
+.undershoot.bottom {
+  background-color: transparent;
+  background-image: linear-gradient(to top, rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.2) 3%, transparent, rgba(0, 
0, 0, 0.02) 25%, transparent); }
+.undershoot.left {
+  background-color: transparent;
+  background-image: linear-gradient(to right, rgba(0, 0, 0, 0.3), transparent 2px, transparent); }
+.undershoot.right {
+  background-color: transparent;
+  background-image: linear-gradient(to left, rgba(0, 0, 0, 0.3), transparent 2px, transparent); }
+.undershoot.sidebar {
+  background-color: transparent; }
+.undershoot:backdrop {
+  background-image: none; }
+
 /* GTK NAMED COLORS
    ----------------
    use responsibly! */