*{box-sizing:border-box}body{background-color:#1c1917}main{display:flex;justify-content:center;align-items:center}.pad-container{display:grid;grid-template-columns:repeat(4,100px);grid-template-rows:repeat(2,100px);gap:10px}button{height:100px;width:100px;border:3px solid white;border-radius:5px;cursor:pointer;opacity:.1}button.on{opacity:1}