<style>
a {
  display:block;
  width:500px;
  height:500px;
  color:white;
}
a:link {
  background:olive;
}
</style>
<body>
<iframe src="resources/dummy.html" style="display:none"></iframe>
<a href="resources/dummy.html">This text should be white on an olive background.</a>
</body>