Merge branch 'psi-dark-fixups' into 'master'

Small dark theme fixup for issue list

See merge request gitlab-org/gitlab!34478

app/assets/stylesheets/framework/variables.scss

@@ -716,8 +716,8 @@ $accepting-mr-label-color: #69d100;
 /*
 * Issues
 */
-$issues-today-bg: #f3fff2;
-$issues-today-border: #e1e8d5;
+$issues-today-bg: #f3fff2 !default;
+$issues-today-border: #e1e8d5 !default;
 $compare-display-color: #888;
 
 /*

app/assets/stylesheets/themes/_dark.scss

@@ -112,6 +112,9 @@ $popover-arrow-outer-color: $gray-800;
 
 $secondary: $gray-600;
 
+$issues-today-bg: #333838;
+$issues-today-border: #333a40;
+
 .gl-label {
   filter: brightness(0.9) contrast(1.1);
 }