CSS :target

Pseudo-classes :target

The :target pseudo-class represents an element that is the target element of the referring URI.

#section1:target { color: orange;}
#section2:target { color: red;}
<a href=#section1> Section 1 </a> |<a href=#section2> Section 2 </a>

<section id=section1>Section 1</section><section id=section2>Section 2</section>