.gif {
  position: absolute;
  top: 0;
  height: 440px;
}
video {
    width: 630px;
    border-radius: 0px;
}
@media (max-width: 480px) {
    video {
        width: 320px;
        }
@media (min-width: 481px) and (max-width: 640px) {
    video {
        width: 320px;
    }
@media (min-width: 641px) and (max-width: 960px) {
    video {
        width: 320px;
    }