fix search-input style of large size

components/form/demo/search-input.md

@@ -16,7 +16,7 @@ const SearchInput = React.createClass({
   getInitialState() {
     return {
       value: '',
-      focus: false
+      focus: false,
     };
   },
   handleInputChange(e) {
@@ -48,7 +48,7 @@ const SearchInput = React.createClass({
         <Input {...this.props} value={this.state.value} onChange={this.handleInputChange}
           onFocus={this.handleFocusBlur} onBlur={this.handleFocusBlur} />
           <div className="ant-input-group-wrap">
-            <Button className={btnCls} onClick={this.handleSearch}>
+            <Button className={btnCls} size={this.props.size} onClick={this.handleSearch}>
               <Icon type="search" />
             </Button>
           </div>

style/components/form.less

@@ -204,7 +204,8 @@ form {
   .ant-search-btn {
     .btn-default;
     border-radius: 0 @border-radius-base - 1 @border-radius-base - 1 0;
-    margin-left: -30px;
+    margin-left: -100%;
+    left: -1px;
     position: relative;
     border-width: 0 0 0 1px;
     z-index: 2;