(fix) dropdown button color

apps/block_scout_web/assets/css/_mixins.scss

@@ -73,6 +73,7 @@
 }
 
 @mixin btn-full($bg-color: $primary, $text-color: #fff) {
+  -webkit-appearance: none !important;
   align-items: center;
   background-color: $bg-color;
   border-radius: 2px;
@@ -121,6 +122,7 @@
 }
 
 @mixin btn-line($bg-color: #fff, $text-color: $secondary) {
+  -webkit-appearance: none !important;
   align-items: center;
   background-color: $bg-color;
   border-radius: 2px;

apps/block_scout_web/assets/css/components/_btn_dropdown_line.scss

@@ -1,13 +1,15 @@
 $btn-dropdown-line-bg: #fff !default;
-$btn-dropdown-line-color: $primary !default;
+$btn-dropdown-line-color: #333 !default;
 
 .btn-dropdown-line {
   @include btn-line($btn-dropdown-line-bg, $btn-dropdown-line-color);
+  border-color: $btn-dropdown-line-color;
+  color: $btn-dropdown-line-color;
   outline: none !important;
-    color: #333;
-    border-color: #e2e5ec;
+
   &:hover {
-    	background-color: transparent;
-    	color: #333;
+    background-color: $btn-dropdown-line-color;
+    border-color: $btn-dropdown-line-color;
+    color: $btn-dropdown-line-bg;
   }
 }