css实现页角翻折动态效果

IMG_6646.GIF

效果如图

---

div部分

 <div class="servicesItem"></div>

只需要一个div，通过控制他的before伪类实现效果

---

css部分

  .servicesItem{
    position: relative;
    padding: 15px;
    background: #f2f2f2;
    border: 1px solid white;
    -webkit-transition: all 0.25s ease-in-out;
    -o-transition: all 0.25s ease-in-out;
    -moz-transition: all 0.25s ease-in-out;
    transition: all 0.25s ease-in-out;
   }
  .servicesItem:before{
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    border-width: 0 25px 25px 0;
    border-style: solid;
    border-color: white white #cccccc #cccccc;
    background: #cccccc;
    display: block;
    width: 0;
    -webkit-transition: all 1.25s ease-in-out;
    -o-transition: all 0.25s ease-in-out;
    -moz-transition: all 0.25s ease-in-out;
    transition: all 0.25s ease-in-out;
    -webkit-box-shadow:  -2px 2px 3px -1px #b3b3b3;
    -moz-box-shadow:  -2px 2px 3px -1px #b3b3b3;
    -o-box-shadow:  -2px 2px 3px -1px #b3b3b3;
    box-shadow:  -2px 2px 3px -1px #b3b3b3;
  }
  .servicesItem:hover{
    background: white;
    border: 1px solid #b3b3b3;
  }
  .servicesItem:hover::before{
    border-width: 0;
  }