#rightcolumn, #footer #bookmarks, #sign-up .btn {
  display: none;
}

#twocols-container, #maincontent, #header {
  float: none;
  width: 100%;
}

#header h1, #header h1 a {
  text-indent: 0;
  width: 100%;
}

#nav, #sign-up, #leftcolumn {
  clear: both;
  float: none;
  width: 100%;
}