:悬停样式的div与图像，不触发

我一直在尝试用纯css在一个网站上做一个覆盖的悬停效果

                       <div class="col-md-4 port-show">
                            <img class="img-responsive" alt="" src="">
                            <h2 class=""></h2>
                            <ul>
                                <li></li>
                                <li></li>
                            </ul>
                        </div>

但我遇到了问题当我悬停在img，覆盖不会触发。我知道我必须改变做法，但就是不知道该怎么做。CSS:

:hover:after{
        content: "";
        z-index: 10;
        display: block;
        position: absolute;
        height: 100%;
        top: 0;
        left: 0;
        right: 0;
        background: red;
        border-radius: 6px;
        border-color: transparent;
    }

你可以看这里。也许这个办法对你有帮助。

http://codepen.io/anon/pen/VKmxZw

.img-holder {
  position: relative;
  z-index: 1;
  display: block;
  width: 350px;
}
.img-holder img {
  display: block;
  width: 100%;
}
.img-holder:after {
  content: " ";
  width: 100%;
  height: 100%;
  background-color: red;
  z-index: 2;
  left: 0;
  top: 0;
  position: absolute;
  opacity: 0;
}
.img-holder:hover:after {
  opacity: 1;
}

<div class="col-md-4 port-show">
  <span class="img-holder">
    <img src="http://placehold.it/350x150" />
  </span>
  <h2 class=""></h2>
  <ul>
    <li></li>
    <li></li>
  </ul>
</div>

你可以按照这个来做你的叠加效果

@import url(http://fonts.googleapis.com/css?family=Open+Sans);
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: "Open Sans", sans-serif;
}
a {
  color: inherit;
  text-decoration: none;
}
h2 {
  color: #c55;
  padding: 50px 0;
  text-align: center;
  text-transform: uppercase;
}
.container {
  background: url("http://static.pexels.com/wp-content/uploads/2015/03/fog-forest-haze-4827-524x350.jpeg");
  background-size: cover;
  background-position: center;
  position: relative;
  margin: auto;
  width: 200px;
  height: 200px;
  cursor: pointer;
  overflow: hidden;
}
.container:hover .overlay {
  opacity: 1;
  width: 100%;
  height: 100%;
}
.container:hover .overlay span {
  opacity: 1;
  -webkit-transition: 1.3s ease;
  transition: 1.3s ease;
}
.container .overlay {
  background: rgba(0, 0, 0, 0.5);
  position: absolute;
  margin: auto;
  width: 0px;
  height: 0px;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  opacity: 0;
  -webkit-transition: .3s ease;
  transition: .3s ease;
}
.container .overlay span {
  color: #fff;
  text-align: center;
  position: absolute;
  margin: auto;
  width: 180px;
  height: 30px;
  line-height: 30px;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  opacity: 0;
}

<h2>Image Overlay Hover Effect</h2>
<div class="container">
  <a href="#">
    <div class="overlay">
      <span>Click to see more...</span>
    </div>
  </a>
</div>

一些简单的叠加代码:

<!DOCTYPE html>
<html >
<head> 
<style type="text/css"> 
  .pic{ width:190px;
   height:190px; opacity: 1; 
   filter: alpha(opacity=100); 
   background: url(http://www.corelangs.com/css/box/img/duck.png) no-repeat; }
   .pic:hover { opacity: 0.3; filter: alpha(opacity=30);}
</style> 
</head> 
<body> 
<div class="pic">
</div> 
</body>
</html>

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