.btn_footer{
    display: flex;
    position: fixed;
    bottom: 0px;
    width: 100%;
    left: 0px;
    height: 45px;
    justify-items: center;
    background: black;
    border-top: 1px solid #5f5f5f;
}
.col3.on{
    background: #6b6b6b;
}
.col3{
    line-height: 45px;
    width: 25%;
    display: inline-block;
    text-align: center;
}
.col3 a{
    color: white;
    width: 100%;
    height: 100px;
    text-align: center;
    text-decoration: none;
}