.mask {
    width: 100%;
    height: 100%;
    background-color: #000;
    opacity: 0.5;
    position: absolute;
    left: 0;
    top: 0;
    text-align: center;
    display: -webkit-flex;
    display: flex;
    -webkit-align-items: center;
    align-items: center;
    -webkit-justify-content: center;
    justify-content: center;
}

.mask > div {
    border: 1px solid #D0D0D0;
    font-size: 12px;
    padding: 5px 15px;
    max-width: 150px;
    color: #494A5F;
    background: url(./loading.gif) no-repeat 5px 5px;
    padding-left: 25px;
    background-color: #FFFFFF;
    word-wrap: break-word;
    margin: 0 auto;
    border-radius: 5px;
}