<style> * { border: 1px solid black; } .flex-container { display: flex; width: 600px; height: 10px; } .flex-item { background: orange; box-sizing: border-box; min-height: 200px; padding-top: 10%; padding-bottom: 20%; } </style> <body> <div class="flex-container"> <div class="flex-item">foo</div>
