main{max-width:720px;margin:0 auto;background-color:#fff;width:100%;height:100vh;position:relative;display:flex;flex-direction:column;scroll-behavior:smooth}#main-container{overflow:hidden auto;flex:1 1;display:flex;flex-direction:column}footer{position:sticky;bottom:0;width:100%;background-color:rgb(255,255,255);z-index:90}