html,body{
    height: 100%;
}.wrapper{
    width: 100%;
    height: 100%;
    margin: 0;
    background-color: #e63a31;
}
.side{
    position: relative;
    overflow: hidden;
    height: 100%;
}
.main_content{
    position: relative;
    width: 90%;
    max-width: 540px;
    margin: 0 auto;
    padding: 30px !important;
    height: calc(100% - 60px);
    overflow: auto;
    background-color: rgba(255,255,255,0.8);
}
.menu{
    width: 100%;
    margin: 30px auto 0 auto;
}
.menu .logo{
    text-align: center;
}
.menu .logo img{
    width: 100px;
}