.main-nav li .sub{display:none;position:absolute;left:0px;top:45px;background:rgba(0,0,0,0.3);width:100%;padding:10px 0px;}
.main-nav li{position:relative;margin-top:20px;}
.main-nav li:hover .sub{display:block;}
.main-nav li a{display:block;line-height:40px;}
.main-nav li{padding-bottom:5px;}
.main-nav li .sub a{display:block;line-height:30px;}
body{
    overflow: hidden;
    overflow-y: scroll;}
#topnav{
    display: flex;
    align-items: center;
    white-space: nowrap;}
.main-nav li .sub{
    width:auto;}
.main-nav li a{
    font-size:16px;}
footer{
    height:auto;
    padding: 10px 0; 
    text-align:center;}
.footer-bottom{
    padding-top: 0;
    margin-top: 0;}