在输入框左边加一个小图标，css样式应该怎么写

    input[type=text]{
        width:300px;
        height:28px;
        color:#666;
        border:1px solid #888;
        border-radius:4px;
        background:url("data:image/gif;base64,R0lGODlhBwAHALMAAAAAAP///+FPgeBOgOJQgt9Pgt9Qgt5Pgd1Rgf///wAAAAAAAAAAAAAAAAAAAAAAACH5BAEAAAkALAAAAAAHAAcAQAQbUEg5JDEhCIMG1kJljIdwEEeAGETmggcmFEYEADs=") no-repeat 8px center / 10px 10px;
        line-height:28px;
        text-indent:24px;
    }
</style>
<input type=text value="请输入" />