控制input 输入框的placeholder

  /*webkit placeholder居右*/
      ::-webkit-input-placeholder
      {
        color: #e7e7e7;
        text-indent: .3rem;
        font-size: .40rem;
      }
      /*//firefox 4-18*/
      :-moz-placeholder
      {
        color: #e7e7e7;
        text-indent: .3rem;
        font-size: .40rem;
      }
      /*//firefox 19+*/
      ::-moz-placeholder
      {
        color: #e7e7e7;
        text-indent: .3rem;
        font-size: .40rem;

      }
      /*//ie*/
      :-ms-input-placeholder
      {
        color: #e7e7e7;
        text-indent: .3rem;
        font-size: .40rem;
      }

如图中代码，你可以更改placeholder的字体颜色，大小，间距