sprite-animation.less

.sprite-animation(@name, @frame-width, @frame-height, @url, @frame-count, @sprite-width, @duration) {
    width: @frame-width;
    height: @frame-height;
    display: block;
    background: url(@url) left center;
    animation: @name @duration steps(@frame-count) infinite;
    @keyframes @name {
        100% {
            background-position: @sprite-width;
        }
    }
}