css: the style should follow design

components/tabs/index.en-US.md

@@ -28,7 +28,7 @@ Ant Design has 3 types Tabs for different situation.
 | onTabClick   | Callback when tab is clicked | Function | - |
 | tabBarExtraContent | Extra element in tab bar | React.ReactNode | - |
 | type         | Basic style of tabs. Options: line, card & editable-card | string | line |
-| size         | Tab bar size. Options: default, small | string | default |
+| size         | Tab bar size. Options: default, small. Only works while `type="line"`. | string | default |
 | tabPosition  | Position of tabs. Options: top, right, bottom & left | string | top |
 | onEdit       | Callback when tab is added or removed, which is executing when set type as editable-card | (targetKey, action): void | - |
 | hideAdd      | Hide plus icon or not, which is effective when set type as editable-card | boolean | false |

components/tabs/index.zh-CN.md

@@ -29,7 +29,7 @@ Ant Design 依次提供了三级选项卡，分别用于不同的场景。
 | onTabClick       | tab 被点击的回调                             | Function | 无            |
 | tabBarExtraContent | tab bar 上额外的元素                       | React.ReactNode | 无          |
 | type | 页签的基本样式，可选 `line`、`card` `editable-card` 类型   | string   | 'line'      |
-| size | 大小，提供 `default` 和 `small` 两种大小  | string   | 'default'      |
+| size | 大小，提供 `default` 和 `small` 两种大小，仅当 `type="line"` 时生效。  | string   | 'default'      |
 | tabPosition | 页签位置，可选值有 `top` `right` `bottom` `left`  | string   | 'top'      |
 | onEdit | 新增和删除页签的回调，在 `type="editable-card"` 时有效 | (targetKey, action): void | 无 |
 | hideAdd | 是否隐藏加号图标，在 `type="editable-card"` 时有效 | boolean   | false    |

components/tabs/style/index.less

@@ -304,7 +304,7 @@
 
   // card style
   &&-card > &-bar &-nav-container {
-    height: 36px;
+    height: 32px;
   }
   &&-card > &-bar &-ink-bar {
     visibility: hidden;
@@ -319,7 +319,7 @@
     margin-right: 2px;
   }
   &&-card > &-bar &-tab {
-    padding: 7px 16px 6px;
+    padding: 5px 16px 4px;
     transition: all 0.3s @ease-in-out;
   }
   &&-card > &-bar &-tab-active {
@@ -329,7 +329,7 @@
     color: @primary-color;
   }
   &&-card > &-bar &-tab-active {
-    padding-bottom: 7px;
+    padding-bottom: 5px;
     transform: translateZ(0);
   }
   &&-card > &-bar &-nav-wrap {