始终在页面底部的层js实现代码

table {border-top:6 solid blue; border-left:6 solid lime;border-right:6 solid orange; border-bottom:6 solid pink;border-collapse:collapse;} td {border-right:1 solid yellow; border-bottom:1 solid cyan;width:50px;border-collapse:collapse;} aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa