fixed #138 not full

style/components/select.less

@@ -58,10 +58,8 @@
       display: none;
     }
 
-    .ie-rotate(1);
     &:before {
-      content: '\e611';
-      .rotate(90deg);
+      content: '\e600';
       transition: transform 0.2s ease;
     }
   }
@@ -332,6 +330,14 @@
         white-space: nowrap;
         cursor: pointer;
 
+        &:first-child {
+          border-top-left-radius: 4px;
+          border-top-right-radius: 4px;
+        }
+        &:last-child {
+          border-bottom-left-radius: 4px;
+          border-bottom-right-radius: 4px;
+        }
         &:hover, &-active {
           background-color: tint(@primary-color, 90%) !important;
         }
@@ -389,9 +395,10 @@
 
   &-open {
     .@{select-prefix-cls}-arrow {
-      .ie-rotate(3);
+      .ie-rotate(2);
+      -ms-transform: rotate(180deg);
       &:before {
-        .rotate(270deg);
+        .rotate(180deg);
       }
     }
     .@{select-prefix-cls}-selection {