variables.less: Add scrollbar-color variable

Author: sukhwinder33445

asset/css/variables.less

@@ -46,6 +46,8 @@
 @default-delete-bg: @state-critical;
 @default-delete-color: @default-text-color-inverted;
 
+@scrollbar-thumb-color: @base-gray-light;
+
 @state-ok: #44bb77;
 @state-up: @state-ok;
 @state-warning: #ffaa44;
@@ -155,6 +157,8 @@
     --default-delete-bg: var(--base-remove-bg);
     --default-delete-color: var(--default-text-color-inverted);
 
+    --scrollbar-thumb-color: var(--base-gray-light);
+
     --primary-button-color: var(--default-text-color-inverted);
     --primary-button-bg: @primary-button-bg;
     --primary-button-hover-bg: @primary-button-hover-bg;