Add overflow to your #colophon. This will work of course, but you can always use clearfix to this elements.
#colophon { background: url(http://lenkapage.com/daylight/wp-content/uploads/2014/04/footer-logo.png) no-repeat scroll 20px 20px transparent; background-color: #00A0E1; color: white; padding: 115px 0 0 100px; margin-bottom: 20px; overflow: hidden; }