User:তাহমিদ/Sandbox/style.css

@keyframes myOwnAnimation {
    0% { bottom: 0; }
    50% { top: 50vh; }
    100% { top: 0; }
}

.myOwnClass {
    position:fixed;
    bottom:0;
    right: 0;
    animation-name: myOwnAnimation;
    animation-duration: 4s;
    animation-delay: 4s;
    animation-iteration-count: infinite;
    animation-direction: alternate;
    animation-timing-function: linear;
}