.wave4{
    display: block;
    position: absolute;
    bottom: 2px;
    right: 2px;
    width: 270px;
    height: 52px;
    line-height: 52px;
    text-align: center;
    background-color: #3f3f3e;

    opacity:0.9;

}
.wave4 a{
    color: #fff;
    font-size: 20px;
}