*,html,body{padding:0;margin:0}*{box-sizing:border-box;font-family:sans-serif;color:#000}.square{height:4rem;width:4rem;border:solid black;background-color:pink;font-size:2.5rem;font-weight:500;display:flex;align-items:center;justify-content:center}.square:active{background-color:#000}.square-div{display:grid;grid-template-columns:repeat(3,0fr);column-gap:5px;row-gap:5px}body{background-color:pink;display:flex;justify-content:center;align-items:center;height:100vh;margin-top:-4rem}