body,html{
    width:100%;
    height:100%;
}
.banner{
    height:100%;
}
body{
    background-color: #F4F5F9;
}
*{
    margin: 0;
    padding: 0;
}

.btn_button{
    width: 100%;
    font-size: 0.26rem;
    font-family:MicrosoftYaHei;
    font-weight:400;
    color:rgba(255,255,255,1);
    line-height:79px;
    text-align: center;
    position: absolute;
    bottom: 0.8rem;
}