<p><a href="#link1">link1</a></p>
<p><a href="#link2">link2</a></p>
<p id="link1">w3tr</p>
<p id="link2">w3tr</p>
:target {
    border: 5px solid red;
    background:white;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.