隐藏select边框及下接箭头方法

代码：

/*套在Select外层，用于隐藏Select框*/
.DivSelect
{
    position: relative;
    background-color: transparent;
    width:  140px;
    height: 17px;
    overflow: hidden; /*隐藏了小三角，因为宽度为110px,而select宽度为130px*/
    border-width:0px;
    border-top-style: none; 
    border-right-style: none; 
    border-left-style: none; 
    border-bottom-style: none;
}

/*设置Select样式*/
.SelectList
{
    position: relative;
    background-color: transparent;
    TOP:   -2px;
    left:-2px;
    border-width: 0px;
    border-top-style: none; 
    border-right-style: none; 
    border-left-style: none; 
    border-bottom-style: none;
    width:160px;
    display:block;
    height: 18px;
    overflow:hidden;
}

                            <div class="DivSelect">
                                <select class="SelectList">
                                    <option>aaaa</option>
                                    <option>aaaa</option>
                                    <option>aaaa</option>
                                    <option>aaaa</option>
                                </select>
                            </div>