显示在页面中间的加载gif

.tp-loader {
background: url(../assets/loader.gif) no-repeat 10px 10px;
background-color: #fff;
margin: -22px -22px;
top: 50%;
left: 50%;
z-index: 10000;
position: absolute;
width: 44px;
height: 44px;
border-radius: 3px;
-moz-border-radius: 3px;
-webkit-border-radius: 3px;
}

 

<div class="tp-loader" style="display: none;"></div>