* {
    margin: 0;
    padding: 0;
}

.pattern {
    position: absolute;
    top: 0;
    width: 6.25%;
}

.pattern_left {
    right: 0;
}

.pattern_right {
    left: 0;
}

.pattern {
    width: 16%;
}

.phone_pic {
    display: block;
    width: 29.3%;
    margin: 32% auto 0;
}

.title {
    font-size: 4rem;
    font-family: '微软雅黑';
    line-height: 3;
    color: #333;
    text-align: center;
    padding-bottom: 8%;
}

.phone_down {
    font-size: 2.8rem;
    border: 1px solid #ccc;
    color: #333;
    line-height: 2.3;
    display: block;
    width: 50%;
    text-align: center;
    border-radius: 30px;
    margin: 0 auto;
    text-decoration: none;
}

.phone_down:active {
    color: #1a8cf7;
    border: 2px solid #1a8cf7;
}
#wx_launch {
    width: 492px;
    height: 105px;
    position: absolute;
    left: 50%;
    transform: translate(-50%);
}
#launch-btn {
    display: block;
    width: 100%;
    height: 100%;
    opacity: 0;
}