update modal style

components/modal/demo/basic.md

@@ -37,6 +37,8 @@ var Test = React.createClass({
         onOk={this.handleOk}
         onCancel={this.handleCancel}>
         <p>对话框的内容</p>
+        <p>对话框的内容</p>
+        <p>对话框的内容</p>
       </Modal>
     </div>;
   }

style/components/dialog.less

@@ -3,8 +3,18 @@
 @import "./dialog/Dialog.less";
 @import "./dialog/Mask.less";
 
-
-.@{dialogPrefixCls}-footer button + button {
-  margin-left: 8px;
-  margin-bottom: 0;
-}
+.@{dialogPrefixCls} {
+  &-header {
+    padding: 13px 18px 14px 16px;
+  }
+  &-body {
+    padding: 16px;
+  }
+  &-footer {
+    padding: 10px 18px 10px 10px;
+  }
+  &-footer button + button {
+    margin-left: 8px;
+    margin-bottom: 0;
+  }
+}