html, body {
    width: 100%;
    width: 100vw;
    height: 100%;
    height: 100vh;
    overflow: hidden;
}

.btns-index {
    /*width: 1.63rem;*/
    /*height: 1.63rem;*/
    width: 80px;
    height: 80px;
}

.index-title-wrap {
    top: 50%;
    left: 0;
    padding-top: 36%;
    margin-top: -80px;
    width: 100%;
    transform: translateY(-50%);
    text-align: center;
    color: #fff;
    /*background: rgba(0, 0, 0, 0.15);*/
}

.index-title-wrap > img {
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.index-title {
    font-size: 0.72rem;
    font-weight: 700;
}

.index-tip {
    margin-top: 0.5rem;
    font-size: 0.3rem;
    letter-spacing: 0.2em;
    line-height: 1;
}