Tweak table head icons style

components/table/style/index.less

@@ -50,19 +50,11 @@
       transition: all .3s;
       width: 14px;
       font-weight: normal;
+      vertical-align: text-bottom;
 
       &:hover {
         color: @text-color;
       }
-
-      &:after {
-        content: '';
-        position: absolute;
-        width: 14px;
-        height: 50px;
-        left: 0;
-        top: -19px;
-      }
     }
 
     .@{table-prefix-cls}-column-sorter + .@{iconfont-css-prefix}-filter {
@@ -218,6 +210,7 @@
     margin-left: 8px;
     display: inline-block;
     width: 14px;
+    height: 14px;
     vertical-align: middle;
     text-align: center;
     font-weight: normal;
@@ -225,7 +218,7 @@
 
     &-up,
     &-down {
-      line-height: 4px;
+      line-height: 6px;
       display: block;
       width: 14px;
       height: 6px;
@@ -243,18 +236,18 @@
       &:after {
         position: absolute;
         content: '';
-        height: 20px;
+        height: 30px;
         width: 14px;
         left: 0;
       }
     }
 
     &-up:after {
-      top: -19px;
+      top: -30px;
     }
 
     &-down:after {
-      bottom: -17px;
+      bottom: -30px;
     }
 
     .@{iconfont-css-prefix}-caret-up,

components/table/style/size.less

@@ -13,26 +13,6 @@
   .@{table-prefix-cls}-footer {
     padding: 12px 8px;
   }
-
-  .@{table-prefix-cls}-column-sorter-up:after {
-    top: -13px;
-    height: 13px;
-  }
-
-  .@{table-prefix-cls}-column-sorter-down:after {
-    bottom: -11px;
-    height: 13px;
-  }
-
-  .@{table-prefix-cls}-thead > tr > th {
-    .@{iconfont-css-prefix}-filter,
-    .@{table-prefix-cls}-filter-icon {
-      &:after {
-        height: 38px;
-        top: -13px;
-      }
-    }
-  }
 }
 
 .@{table-prefix-cls}-small {
@@ -51,13 +31,6 @@
       > .@{table-prefix-cls}-thead > tr > th {
         background: @component-background;
         border-bottom: @border-width-base @border-style-base @border-color-split;
-        .@{iconfont-css-prefix}-filter,
-        .@{table-prefix-cls}-filter-icon {
-          &:after {
-            height: 39px;
-            top: -14px;
-          }
-        }
       }
     }
 
@@ -79,16 +52,6 @@
     .@{table-prefix-cls}-row:last-child td {
       border-bottom: 0;
     }
-
-    .@{table-prefix-cls}-column-sorter-up:after {
-      top: -14px;
-      height: 13px;
-    }
-
-    .@{table-prefix-cls}-column-sorter-down:after {
-      bottom: -11px;
-      height: 13px;
-    }
   }
 
   &.@{table-prefix-cls}-bordered {