边栏导航是重叠的页脚

Question

我的侧边栏导航与页脚重叠，我该如何解决？

Answer 1

    #myScrollspy //sidebar element{
    width:225px;
    font-family: 'GillSans';
    font-size:14px;
    text-transform: uppercase;
    padding:25px 25px 15px 25px;
    z-index:12;
    color:#702813;
    border: 2px solid #702813;
}

footer{

}