input获得焦点状态

<input type="text">

 input[type=text] {
      -webkit-transition: all 0.30s ease-in-out;
      -moz-transition: all 0.30s ease-in-out;
      -ms-transition: all 0.30s ease-in-out;
      -o-transition: all 0.30s ease-in-out;
      outline: none;
      padding: 3px 0px 3px 3px;
      margin: 5px 1px 3px 0px;
      border: 1px solid #ddd;
    }
    input[type=text]:focus {
      box-shadow: 0 0 5px rgba(81, 203, 238, 1);
      padding: 3px 0px 3px 3px;
      margin: 5px 1px 3px 0px;
      border: 1px solid rgba(81, 203, 238, 1);
    }