[gnome-shell-sass] theme: Make Dash background color solid

[Florian Müllner <fmuellner src gnome org>]

commit b8cf51c0837a9b3d879fa8c5a641d95ca32f4488
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Thu Jan 21 19:02:00 2021 -0300

    theme: Make Dash background color solid
    
    This is the same color that the Dash currently has, except
    it isn't transparent.
    
    The reason for this change is that the app grid coming from
    the bottom and passing below the Dash looks odd with the
    transparency there.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1593>

 widgets/_dash.scss | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/widgets/_dash.scss b/widgets/_dash.scss
index 5048383..a1f6249 100644
--- a/widgets/_dash.scss
+++ b/widgets/_dash.scss
@@ -1,11 +1,12 @@
 /* Dash */
 
+$dash_background_color: #3b3b3b;
 $dash_placeholder_size: 32px;
 $dash_spacing: $base_padding + 4px;
 $dash_border_radius: $modal_radius * 1.5;
 
 #dash {
-  @extend %overview_panel;
+  background-color: $dash_background_color;
   @include fontsize($base_font_size - 2);
   margin: $base_margin * 4 $base_margin * 2;
   padding: ($dash_spacing / 2) 0;