.center {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
       width:400px;
    margin-right: -50%;
    transform: translate(-50%, -50%)
}
.gif-center{
    margin: 0;
    position: absolute;
    top: 85%;
    left: 50%;
       width:100px;
    margin-right: -50%;
    transform: translate(-50%, -50%)
    }