#canvas1 {
    position: absolute;
    top: 20%;
    right: 0;
    width: 45%;
    z-index: -1;
    border-radius: 100%;
    opacity: 0.5;
    animation: aaa 3s ease-in-out infinite 0.5s alternate;
}


@keyframes aaa {
    0%{
        opacity: 0.5;
    }
    100%{
        opacity: 1;
    }
}