div.thebe_controls{margin-top:15px;margin-bottom:5px}div.thebe_controls.kernel_controls{padding:20px;background:rgba(200,200,200,0.4);max-width:600px;text-align:center;margin:10px auto}div.cell,p,pre{max-width:600px}div.cell,p,pre{margin:10px auto}div.cell div.input{border:1px solid #c8c8c8;padding:10px}h1,h2,h3,h4,h5,h6{text-align:center}