gif animation

gif-animation.css

/* @see https://www.innos.com/ru/#/intro */
.intro__phone-screen,
.intro__phone-screen:after {
    height: 575px;
    position: absolute;
    content: ''
}
.intro__phone-screen {
    top: 57px;
    left: 18px;
    width: 319px;
    overflow: hidden;
    background-image: url(../images/gif/1.jpg);
    background-position: 0 0;
    backface-visibility: hidden;
    transform: translateZ(0) scalex(.995);
    transform-origin: top left;
    will-change: background-position;
    animation: gif1 6s step-end infinite;
    animation-play-state: paused;
    z-index: 3
}