Okay, first exercise, lol I don't know where's the issue, but I get the mentioned error constantly. I didn't write the whole code in CSS, I just wrote the one for the first div with the 'header' id and it seems something's wrong. Check this out:
<!DOCTYPE html> <html> <head> <link type="text/css" rel="stylesheet" href="stylesheet.css"/> <title></title> </head> <body> <div id:"header"></div> <div class:"left"></div> <div class:"right"></div> <div id:"footer"></div> </body> </html>
background-color:red; border-radius:5px; height:100px; width:100px;
So, why isn't the 'header' div created? I don't get it.