body { font-family: Helvetica, Arial, sans-serif; background-color: #121212; font-size: 0.5em; } .bloc { position: relative; margin-top: 0; margin-left: auto; margin-right: auto; width: 900px; height: 900px; } .flash { position: absolute; margin-top: 50px; width: 900px; height: 500px; } p { color: #FFFFFF; margin-left: 20px; }