footer{
    display:grid;
    justify-content: center;
    align-items: center;
    justify-items: center;
    width:100%;
    max-width:100%;
    height:70px;
    min-height:70px;
    z-index:3;
}
footer::after{
    content: " ";
    width: 100%;
    max-width:100%;
    height:70px;
    position: absolute;
    background-color:rgb(170, 255, 170);
    z-index:-1;
}