.sidenav {
    height: calc(100vh - 62px);
    min-height: 200px;
    width: 0;
    position: fixed;
    z-index: 1000;
    top: 65px;
    left: 0;
    overflow-x: hidden;
    transition: 0.5s;
    padding-top: 60px;
}
.sidenav a {
    padding: 8px 8px 8px 32px;
    text-decoration: none;
    /*font-size: 25px;*/
    /*color: #818181;*/
    display: block;
    transition: 0.3s;
}
.sidenav a:hover {
    color: #f1f1f1;
}
.sidenav .closebtn {
    position: absolute;
    top: 0;
    right: 25px;
    font-size: 36px;
    margin-left: 50px;
}
#sidebarmain {
    transition: margin-left .5s;
    padding: 16px;
}
@media screen and (max-height: 450px) {
    .sidenav {padding-top: 15px;}
    .sidenav a {font-size: 18px;
}
}