Update sidebar-notice

Added notice background variable

Author: lazuee

discord/sidebar-notice/import.css

@@ -5,6 +5,7 @@
     --notice-margin-left: 0px;
     --notice-margin-right: auto;
 
+	--notice-background: var(--background-secondary);
     --notice-enable-height-adjust: true;
     --notice-icon-join: transparent;
     --notice-icon-welcome: url("https://discord.com/assets/7f809e89e310c87b2e3f.svg");
@@ -53,7 +54,7 @@ html {
 
     >div.notice_be03aa {
         align-content: space-between;
-        background: var(--background-secondary);
+        background: var(--notice-background);
         border-bottom: 1px solid var(--background-secondary);
         border-radius: 0;
         bottom: var(--notice-margin-bottom);
@@ -123,7 +124,7 @@ html {
             }
 
             &:after {
-                background: linear-gradient(158deg, transparent 0%, var(--background-secondary) 80%), linear-gradient(5deg, transparent 60%, var(--background-secondary) 90%), linear-gradient(74deg, transparent 3%, var(--background-secondary) 85%), var(--notice-icon);
+                background: linear-gradient(158deg, transparent 0%, var(--notice-background) 80%), linear-gradient(5deg, transparent 60%, var(--notice-background) 90%), linear-gradient(74deg, transparent 3%, var(--notice-background) 85%), var(--notice-icon);
                 background-position: top center;
                 background-repeat: no-repeat;
                 content: "";