.tip_wrap {
    width: 100%;
    height: 900px;
    display: table;
    overflow: hidden;
}
.tip {
    display: table-cell;
    vertical-align: middle;
    text-align: center;
    position: relative;
    top: -150px;
}
.tip .text {
    font-size: 38px;
    margin-bottom: 20px;
}
.tip .btn {
    font-size: 30px;
    margin-right: 40px;
}