Let's code some flags using hex color values.

<html> <head> <style>body{background-color: #cccccc; text-align: center;}p{width: 200px; height: 50px; margin: 0 auto;}.red{background-color: #ff0000;}.white{background-color: #ffffff;}.green{background-color: #00bb00;}.yellow{background-color: #ffff00;}.blue{background-color: #0000ff;}.black{background-color: #000000;}</style></head> <body> <div> <h3>Austria</h3> <p class="red"></p><p class="white"></p><p class="red"></p></div><div> <h3>Gabon</h3> <p class="green"></p><p class="yellow"></p><p class="blue"></p></div><div> <h3>Germany</h3> <p class="black"></p><p class="red"></p><p class="yellow"></p></div></body></html>]]>