body					{ margin: 0; }

body > div				{ display: flex; flex-flow: row wrap; align-items: center; align-content: center; border: 1px solid #ff0000; height: 200px; }

div > div:nth-of-type(1)		{ width: 400px; padding: 20px; background-color: #00ff00; }
div > div:nth-of-type(2)		{ width: 400px; padding: 20px; background-color: #0000ff; color: #ffffff; }