去掉select dropdown的边框阴影

node_module/element-theme-chalk/src/select-dropdown.scss

@@ -8,7 +8,6 @@
   border: $--select-dropdown-border;
   border-radius: $--border-radius-base;
   background-color: $--select-dropdown-background;
-  box-shadow: $--select-dropdown-shadow;
   box-sizing: border-box;
   margin: 4px 0;
 

theme/index.css

@@ -2389,8 +2389,6 @@ $--checkbox-disabled-checked-icon-color: $--disabled-fill-base !default;*/
   border: solid 1px #B3B5BA;
   border-radius: 3px;
   background-color: #FFFFFF;
-  -webkit-box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
-  box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
   -webkit-box-sizing: border-box;
   box-sizing: border-box;
   margin: 4px 0; }
@@ -13752,8 +13750,6 @@ $--checkbox-disabled-checked-icon-color: $--disabled-fill-base !default;*/
   border: solid 1px #B3B5BA;
   border-radius: 3px;
   background-color: #FFFFFF;
-  -webkit-box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
-  box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
   -webkit-box-sizing: border-box;
   box-sizing: border-box;
   margin: 4px 0; }

theme/pagination.css

@@ -1129,8 +1129,6 @@ $--checkbox-disabled-checked-icon-color: $--disabled-fill-base !default;*/
   border: solid 1px #B3B5BA;
   border-radius: 3px;
   background-color: #FFFFFF;
-  -webkit-box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
-  box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
   -webkit-box-sizing: border-box;
   box-sizing: border-box;
   margin: 4px 0; }

theme/select-dropdown.css

@@ -601,8 +601,6 @@ $--checkbox-disabled-checked-icon-color: $--disabled-fill-base !default;*/
   border: solid 1px #B3B5BA;
   border-radius: 3px;
   background-color: #FFFFFF;
-  -webkit-box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
-  box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
   -webkit-box-sizing: border-box;
   box-sizing: border-box;
   margin: 4px 0; }

theme/select.css

@@ -865,8 +865,6 @@ $--checkbox-disabled-checked-icon-color: $--disabled-fill-base !default;*/
   border: solid 1px #B3B5BA;
   border-radius: 3px;
   background-color: #FFFFFF;
-  -webkit-box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
-  box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
   -webkit-box-sizing: border-box;
   box-sizing: border-box;
   margin: 4px 0; }