main.css

html
{
    background-color: #E53935;
    height: wh;
}

h2
{
    color: white;
}

h1
{
    text-align: center;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 50px;
    color: white;
}

hr
{
    border-style: solid;
    border-width: 2px;
    color: white;
}

.center
{
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 15%;
    height: auto;
    border-radius: 25%;
    border-style: solid;
    border-width: 2px;
}

.audio
{
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.sidenav
{
    height: 100%;
    width: 0;
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    background-color: #9575CD;
    overflow-x: hidden;
    padding-top: 60px;
    transition: 0.5s;
}

.sidenav a
{
    padding: 8px 8px 8px 32px;
    text-decoration: none;
    font-size: 40px;
    color: white;
}

.sidenav a:hover
{
    color: black;
}

.sidenav .closebtn
{
    position: absolute;
    top: 0px;
    right: 25px;
    font-size: 50 px;
    margin-left: 50px;
}

#main
{
    transition: margin-left .5s;
    padding: 20px;
    color: white;
}


<!-- @media screen and (max-height: 450px) 
{
    .sidenav{ padding-top: 15px;}
    .sidenav a{ font-size: 40px;}
}

 -->