.container { max-width:480px; margin:0 auto; padding:2rem; 	}
    
    h1 { font-size:1.5rem; margin:0.5rem 0; }
    p { margin-bottom:1.5rem; }
    a.button, button { display:block; background-color:rgba(0,0,0,0.7); color:#fff; text-decoration:none;
      padding:0.9rem; border-radius:10px; margin:0.5rem 0; font-weight:600; text-align:center; }
    a.button:hover { background-color:rgba(255,255,255,0.7); color:#000; }
    iframe { width:100%; border:0; height:400px; margin-top:1.5rem; }