html,
body {
    width: 100%;
    height: 100%;
    font-size: 16px;
    box-sizing: border-box;
    padding: 0;
    margin: 0;
    text-align: center;
    background-color: #000;
}
.pr {
    position: relative;
}

.pa {
    position: absolute;
}

* {
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
}

.call-container {
    width: 6.4rem;
    height: 11.36rem;
    color: #fff;
    font-size: .24rem;
    margin: 0 auto;
}

.btn {
    cursor: pointer;
}

.btn:active {
    transform: scale(.98);
}

.call-container .btn_dl {
    width: 5rem;
    height: .8rem;
    left: 50%;
    margin-left: -2.5rem;
    top: 7.04rem;
    display: none;
}
.call-container .btn_call {
    width: 5rem;
    height: .8rem;
    left: 50%;
    margin-left: -2.5rem;
    top: 8.14rem;
    display: none;
}
.call-container.isShowBtns .btn_dl, 
.call-container.isShowBtns .btn_call{
    display: block;
}


/* wx，qq中转页背景图*/
.call-container .os-mask {
    width: 6.4rem;
    height: 11.36rem;
    left: 0;
    top: 0;
    display: none;
}
.call-container.isNZ .os-mask {
    display: block;
}