fix dropdown issue, add autoprefix for scss

css/functions/checkbox.scss

@@ -1,5 +1,3 @@
-@import './func.scss';
-
 $boxBorderColor: #999898;
 $boxCheckedColor: #1890ff;
 $boxDisabledColor: #d9d9d9;
@@ -13,9 +11,9 @@ $boxDisabledColor: #d9d9d9;
         height: 14px;
         background-color: #fff;
         border: 1px solid $boxBorderColor;
-        @include user-select(none);
-        @include border-radius(2px);
-        @include transition(all .2s);
+        user-select: none;
+        border-radius: 2px;
+        transition: all .2s;
         cursor: pointer;
 
         >svg {
@@ -27,7 +25,7 @@ $boxDisabledColor: #d9d9d9;
             fill: #fff;
             transform: scale(0);
             opacity: 0;
-            @include transition(all .08s cubic-bezier(.78, .14, .15, .86));
+            transition: all .08s cubic-bezier(.78, .14, .15, .86);
         }
     }
 

css/functions/func.scss

@@ -1,46 +1,3 @@
-@mixin user-select($prop) {
-    -moz-user-select: $prop;
-    -ms-user-select: $prop;
-    user-select: $prop;
-    -webkit-user-select: $prop;
-}
-
-@mixin border-radius($property) {
-    -moz-border-radius: $property;
-    -webkit-border-radius: $property;
-    border-radius: $property;
-}
-
-@mixin box-shadow($property) {
-    -webkit-box-shadow: $property;
-    box-shadow: $property;
-}
-
-@mixin box-shadow2($p1, $p2) {
-    -webkit-box-shadow: $p1, $p2;
-    box-shadow: $p1, $p2;
-}
-
-@mixin box-shadow3($p1, $p2, $p3) {
-    -webkit-box-shadow: $p1, $p2, $p3;
-    box-shadow: $p1, $p2, $p3;
-}
-
-@mixin transition($property) {
-    -webkit-transition: $property;
-    transition: $property;
-}
-
-@mixin transition2($p1, $p2) {
-    -webkit-transition: $p1, $p2;
-    transition: $p1, $p2;
-}
-
-@mixin transition3($p1, $p2, $p3) {
-    -webkit-transition: $p1, $p2, $p3;
-    transition: $p1, $p2, $p3;
-}
-
 @mixin scrollbar() {
     &::-webkit-scrollbar {
         width: 8px;