fix bugs on mobile

t/css/main.css

@@ -45,6 +45,10 @@ header div:nth-child(1){
 	outline-style: none;
 	font-size:15px;
 	font-family:'georgia',  "微软雅黑";
+	-webkit-tap-highlight-color: #FFF;
+	box-sizing:border-box;
+	-moz-box-sizing:border-box; /* Firefox */
+	-webkit-box-sizing:border-box; /* Safari */
 }
 
 header div:nth-child(2){

t/html/view/header_search.html

@@ -3,6 +3,6 @@
 		<input id="search_input" ng-model="keywords" type="text" placeholder="请输入关键字"/>
 	</div>
 	<div>
-		<input id="search_btn" ng-click="search()" value="搜索"/>
+		<input type="button" id="search_btn" ng-click="search()" value="搜索"/>
 	</div>
 </header>