*{box-sizing:border-box}html,body{height:100%;margin:0;padding:0;font-family:sans-serif}.app{display:flex;flex-direction:column;align-items:center;min-height:100vh;padding:20px;background-color:#fff;text-align:center}.app h1{flex-shrink:0;margin-top:0;margin-bottom:20px;color:#333;font-size:1.8rem}@media (max-width: 768px){.app{padding:10px}.app h1{font-size:1.5rem;margin-bottom:15px}.controls-toolbar{width:100%}}