.okvir {
    display: flex;
    background: radial-gradient(black 30%, #2F4274);
}

.disco {
    position: absolute;
    width: 320px;
    height: 320px;
    transition: 1s;
    z-index: 1;
    opacity: 0.8;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    -o-transform: translate(-50%, -50%);
}

.disco::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: url("../img/giphy.gif");
    background-repeat: no-repeat;
    z-index: 1;
    border-radius: 50%;
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    -ms-border-radius: 50%;
    -o-border-radius: 50%;
}