           border:1px solid blue;
            /*清除掉默认的padding*/
            padding:0px;

            /*提示字首行缩进*/
            text-indent: 10px;

            /*去掉蓝色高亮框*/
            outline: none;

            /*用浮动解决内联元素错位及小间距的问题*/
            float:left;
        }

        .input_sub{
            width: 100px;
            height: 40px;
            background: blue;
            /*去掉submit按钮默认边框*/
            border: