#topbar {
  background: DarkOrange;
}

#backtotop {
   background: BlueViolet;
}

#backtotop a:hover,
#backtotop a:visited:hover {
   background: OrangeRed;
}

#content a { color: LimeGreen; }
#content a:hover, a:visited:hover { color: DeepSkyBlue; }