#container1, #container2 {
    position: relative;
    width: 100%;
    background: #000;
    background: -webkit-linear-gradient(to right, #000, #3d006b);
    background: linear-gradient(to right, #000, #3d006b 190%);
    overflow: hidden;
    z-index: 1;
}

#universe1, #universe2 {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.star0, .star1, .star2, .star3 {
    position: absolute;
    background-color: #fff;
    border-radius: 50%;
    opacity: 0.3;
    z-index: -1;
}

.star0 {
    height: 1px;
    width: 1px;
}

.star1 {
    height: 2px;
    width: 2px;
}

.star2 {
    height: 3px;
    width: 3px;
}

.star3 {
    height: 2px;
    width: 2px;
}

.main-content {
    position: relative;
    z-index: 2;
}