使用图标和文本作为输入占位符

    input {
    border: none;
    outline: none;
    font-size:2em;
    border: 1px solid #767676;
    background-color: #FFFFFF;
    width: 331px;
    height: 44px;
    -moz-border-radius: 5px;
    -webkit-border-radius: 5px;
    -khtml-border-radius: 5px;
    border-radius: 5px;
     -webkit-box-sizing: border-box;
       -moz-box-sizing: border-box;
            box-sizing: border-box;
}
:focus::-webkit-input-placeholder {color: transparent}
:focus::-moz-placeholder          {color: transparent}
:focus:-moz-placeholder           {color: transparent}
:focus:-ms-input-placeholder      {color: transparent}