[fractal] css: Make round buttons circular

[Daniel Garcia Moreno <danigm src gnome org>]

commit 80bd1f5c14f15caa0daf78568ee095bef4decfaa
Author: Christopher Davis <brainblasted disroot org>
Date:   Fri Oct 2 17:23:32 2020 -0700

    css: Make round buttons circular
    
    Fixes an issue where the scroll button was a weird oval.

 fractal-gtk/res/app.css | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/fractal-gtk/res/app.css b/fractal-gtk/res/app.css
index f57e7ab1..6af2763e 100644
--- a/fractal-gtk/res/app.css
+++ b/fractal-gtk/res/app.css
@@ -194,7 +194,10 @@ row:not(:selected) .member-uid {
 
 .round-button {
   border-radius: 9999px;
+  padding: 12px;
   -gtk-outline-radius: 9999px;
+   min-width: 24px;
+   min-height: 24px;
 }
 
 .play-icon {