fix: collapsible mobile (#1267)

Author: NiclasNorin

assets/source/3.0/sass/navigation/_collapsible-search.scss

@@ -17,27 +17,14 @@
         overflow: hidden;
         z-index: $level-7;
         opacity: 0;
-  
-        @media (max-width: 799px) {
-          position: fixed;
-          top: calc(var(--base, 8px) * 1.5);
-        }
 
         &.open {
-          width: calc(100% - calc(var(--base, 8px) * 3.5));
+          width: calc(var(--base, 8px) * 35);
           opacity: 1;
 
           @media (min-width: 800px) {
             width: calc(var(--base, 8px) * 50);
           }
-  
-          @media (max-width: 799px) {
-            right: calc(var(--base, 8px) * 2);
-  
-            #{$parent}__group {
-              width: 100%;
-            }
-          }
         }
 
         &.closing {
@@ -139,16 +126,4 @@
         }
       }
     }
-  }
-  
-  .admin-bar {
-    .collapsible-search-form {
-      position: relative;
-    
-      &__form {
-        @media (max-width: 799px) {
-          top: var(--wp-admin--admin-bar--height, 32px);
-        }
-      }
-    }
-}
+  }