純CSS3鼠標滑過圖片遮罩層動畫特效

<link rel="stylesheet" type="text/css" href="path/to/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="path/to/css/font-awesome.min.css">

<div class="container">
 <div class="row">
 <div class="col-md-4 col-sm-6">
  <div class="box">
  <img src="images/1.jpg">
  <div class="box-content">
   <h3 class="title">雷神索爾</h3>
   <span class="post">卡通惡搞造型</span>
   <ul class="icon">
   <li><a href="#"><i class="fa fa-search"></i></a></li>
   <li><a href="#"><i class="fa fa-link"></i></a></li>
   </ul>
  </div>
  </div>
 </div>
 
 <div class="col-md-4 col-sm-6">
  <div class="box">
  <img src="images/2.jpg">
  <div class="box-content">
   <h3 class="title">蜘蛛俠</h3>
   <span class="post">卡通惡搞造型</span>
   <ul class="icon">
   <li><a href="#"><i class="fa fa-search"></i></a></li>
   <li><a href="#"><i class="fa fa-link"></i></a></li>
   </ul>
  </div>
  </div>
 </div>
 
 <div class="col-md-4 col-sm-6">
  <div class="box">
  <img src="images/3.jpg">
  <div class="box-content">
   <h3 class="title">鋼鐵俠</h3>
   <span class="post">卡通惡搞造型</span>
   <ul class="icon">
   <li><a href="#"><i class="fa fa-search"></i></a></li>
   <li><a href="#"><i class="fa fa-link"></i></a></li>
   </ul>
  </div>
  </div>
 </div>
 </div>
</div>

.box{
 text-align: center;
 overflow: hidden;
 position: relative;
}
.box:before{
 content: "";
 width: 0;
 height: 100%;
 background: #000;
 padding: 14px 18px;
 position: absolute;
 top: 0;
 left: 50%;
 opacity: 0;
 transition: all 500ms cubic-bezier(0.47, 0, 0.745, 0.715) 0s;
}
.box:hover:before{
 width: 100%;
 left: 0;
 opacity: 0.5;
}
.box img{
 width: 100%;
 height: auto;
}
.box .box-content{
 width: 100%;
 padding: 14px 18px;
 color: #fff;
 position: absolute;
 top: 38%;
 left: 0;
}
.box .title{
 font-size: 25px;
 font-weight: 600;
 line-height: 30px;
 text-transform: uppercase;
 margin: 0;
 opacity: 0;
 transition: all 0.5s ease 0s;
}
.box .post{
 font-size: 15px;
 text-transform: capitalize;
 opacity: 0;
 transition: all 0.5s ease 0s;
}
.box:hover .title,
.box:hover .post{
 opacity: 1;
 transition-delay: 0.7s;
}
.box .icon{
 padding: 0;
 margin: 0;
 list-style: none;
 margin-top: 15px;
}
.box .icon li{
 display: inline-block;
}
.box .icon li a{
 display: block;
 width: 40px;
 height: 40px;
 line-height: 40px;
 border-radius: 50%;
 background: #f74e55;
 font-size: 20px;
 font-weight: 700;
 color: #fff;
 margin-right: 5px;
 opacity: 0;
 transform: translateY(50px);
 transition: all 0.5s ease 0s;
}
.box:hover .icon li a{
 opacity: 1;
 transform: translateY(0px);
 transition-delay: 0.5s;
}
.box:hover .icon li:last-child a{
 transition-delay: 0.8s;
}
@media only screen and (max-width:990px){
 .box{ margin-bottom: 30px; }
}