.center {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-right: -50%;
    justify-content: center;
    text-align: center;
    transform: translate(-50%, -50%)
}

.footer {
    position:absolute;
    bottom:0;
    left: 50%;
    margin-right: -50%;
    transform: translate(-50%, -50%);
    justify-content: center;
    text-align: center;
    height:20px;
 }