I noticed some websites from a few days ago that have links inside their article having thick underlines and when you mouse hover it highlights the text. I found that the CSS style is beautiful. Below is an example of this:
Links with Thick Underline and Highlight Text on Mouse Hover
The following CSS is for thick underlines for hyperlinks inside the post body. Modified the CSS class (.post-body a) according to your website elements.
.post-body a { background-color: transparent; color: inherit; text-decoration: none; transition: background .15s cubic-bezier(.33,.66,.66,1); border-bottom: 3px solid #b4e7f8; box-shadow: inset 0 -3px 0 #b4e7f8; overflow-wrap: break-word; word-break: break-word; word-wrap: break-word; }
CSS for Highlighting Text on Mouse Hover
.post-body a:hover { background-color: #b4e7f8; }
Output
This is the demo hyperlink.