input输入框的背景字和背景图样式

      input{
        width: 5.5rem;
        height: 1rem;
        background: #F5F5F5;
        border-radius: 0.5rem 0.5rem 0.5rem 0.5rem;
        opacity: 1;
        border: none;
        text-align: center;
        margin: 0.3rem auto 0.4rem;
      }
      input::-webkit-input-placeholder {  
        font-size: 0.26rem;
        font-weight: 400;
        color: #BBBBBB;
        line-height: 0.36rem;
      } 
      input:-moz-placeholder { 
        font-size: 0.26rem;
        font-weight: 400;
        color: #BBBBBB;
        line-height: 0.36rem;
      } 
      input::-moz-placeholder { 
        font-size: 0.26rem;
        font-weight: 400;
        color: #BBBBBB;
        line-height: 0.36rem; 
      } 
      input:-ms-input-placeholder {
        font-size: 0.26rem;
        font-weight: 400;
        color: #BBBBBB;
        line-height: 0.36rem;
      }
      
      
      input背景图片：            
      background-image: url('../img/wallet_icon_diamonds.png');  //设置背景图  
      background-size: 0.4rem 0.4rem;                            //设置大小  
      background-repeat: no-repeat;                              //不重复  
      background-position: 0.3rem;                               //位置