game-sdk/public/static/api/css/loading.css

@CHARSET "UTF-8";

.loading_wrap {
    position: fixed;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    background: transparent;
}

.loading {
    position: absolute;
    left: 50%;
    top: 50%;
    margin-left: -45px;
    margin-top: -45px;
    width: 90px;
    height: 90px;
    background: url(../images/loading.png) no-repeat;
    background-size: 360px 90px;
}

.loading.animate {
    -webkit-animation: 0.6s animate_loading steps(4) infinite;
}

@-webkit-keyframes animate_loading {
    0% {
        background-position: 0 50%;
    }
    100% {
        background-position: -360px 50%;
    }
}