#0 CSS Tricks, 4 ways to center a div | #26 CSS
1: margin: 0 auto; > display: block; line-height: 100%; vertical-align: middle;
2: position: absolute/relative; top: 50%; left: 50%; transform: translate(-50%,-50%);
3: display: flex; justify-content: center; align-items: center;
4: display: grid; align-content: center;