The code for Lab01.css is: @charset "utf-8"; /* Lab01.css */ article { background-color: #efe; margin-bottom: 0.5em; } aside { background-color: #efd; margin-bottom: 1em; } footer { background-color: #eef; margin-bottom: 1em; } h1 { text-align: center; } h3 { margin: .25em 0; } header { background-color: #fee; margin-bottom: 1em; }