.loading_shade {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    display: -webkit-box;
    -webkit-box-pack: center;
    -webkit-box-align: center;
    background: rgba(255,255,255,.7);
    z-index: 99
}

.loading_box {
    padding: 30px;
    box-sizing: border-box;
    -webkit-box-sizing: border-box
}

.loading_box .loading {
    width: 100px;
    height: 100px;
    margin: 0 auto;
    background-color: #ff8814;
    border-radius: 100%;
    -webkit-animation: load_scaleout 1s infinite ease-in-out;
    animation: load_scaleout 1s infinite ease-in-out
}

.loading_box .loading_text {
    text-align: center;
    color: #333;
    font-size: .12rem
}

@-webkit-keyframes load_scaleout {
    0% {
        -webkit-transform: scale(0)
    }

    100% {
        -webkit-transform: scale(1);
        opacity: 0
    }
}

@keyframes load_scaleout {
    0% {
        transform: scale(.1);
        -webkit-transform: scale(.1)
    }

    100% {
        transform: scale(1.5);
        -webkit-transform: scale(1.5);
        opacity: 0
    }
}

.loading_oneline_box {
    font-size: .12rem;
    color: #FFF;
    text-align: center
}

<section class="loading_shade" id="J_loading_box">
    <div class="loading_box">
        <div class="loading"></div>
        <p class="loading_text">努力加载中...</p>
    </div>
</section>