remove circle-mini class

src/client/styles/scss/_admin.scss

@@ -136,24 +136,18 @@ $slack-work-space-name-card-border: #efc1f6;
     }
 
     .grw-bridge-proxy-circle {
-      @mixin circle {
+      .circle {
         left: 50%;
-        border-radius: 50%;
-        transform: translate(-50%, -50%);
-      }
-
-      .circle-default {
-        @include circle;
         width: 100px;
         height: 100px;
         border: 13px solid;
-      }
-
-      .circle-mini {
-        @include circle;
-        width: 50px;
-        height: 50px;
-        border: 8px solid;
+        border-radius: 50%;
+        transform: translate(-50%, -50%);
+        @include media-breakpoint-down(md) {
+          width: 50px;
+          height: 50px;
+          border: 8px solid;
+        }
       }
 
       .circle-inner {