body{flex-direction:column;min-height:100vh;margin:0;font-family:Verdana,Geneva,Tahoma,sans-serif;display:flex}nav{text-align:center;background-color:#d1d6ff;padding:2rem}main{flex:1;width:100%;max-width:1100px;margin:0 auto}main h1{text-align:left}footer{background-color:#d1d6ff;padding-bottom:2rem;padding-left:1rem}table{border:1px solid #000}td{border:1px solid #000;padding:0 10px}.deleteBtn{cursor:pointer;background-color:#0000;border:none}tr:nth-child(2n){background-color:#ddd}.addCourse{border:2px solid #000;width:100px;margin-top:1rem;margin-bottom:1rem;padding:.5rem}label{display:block}input,select{width:100%;max-width:300px;display:block}@media (width<=900px){main{margin-left:20px}table{width:90%;max-width:600px;margin-bottom:20px;font-size:1rem}}