Sprite

Original sprite

Animated

.bonfire {
    width: 96px;
    height: 96px;
    object-fit: cover;
    animation: bonfire 750ms steps(4, jump-none) infinite;
}

@keyframes bonfire {
    from {
        object-position: 0;
    }
    to {
        object-position: 100%;
    }
}