h2{ text-align: center; } .layer{ width: 70%; margin-right: auto; margin-left: auto; } section { border:4px solid grey; border-radius:15px; box-shadow: 5px 5px 5px grey; float:left; height:360px; padding: 20px; margin:10px; } #plotSettings { width:160px; } #plot { width:550px; }