Style your underlines

We shouldn’t rely on colour alone to indicate that something is interactive.

Take links, for example. Sure, you can give them a different colour to the surrounding text, but you shouldn’t stop there. Make sure there’s something else that distinguishes them. You could make them bold. Or you could stick with the well-understood convention of underlying links.

This is where some designers bristle. If there are a lot of links on a page, it could look awfully cluttered with underlines. That’s why some designers would rather remove the underline completely.

As Manu observed:

I’ve done a lot of audits in the first half of this year and at this point a believe that designing links without underlines is a kink. The idea that users don’t understand that links are clickable arouses some designers. I can’t explain it any other way.

But underlining links isn’t the binary decision it once was. You can use CSS to style those underlines just as you’d style any other part of your design language.

Here’s a regular underlined link.

For a start, you can adjust the distance of the underline from the text using text-underline-offset. If you’re using a generous line-height, use a generous distance here too.

Here’s a link with an offset underline.

If you’d rather have a thinner or thicker underline, use text-decoration-thickness.

Here’s a link with a thin underline.

The colour of the underline and the colour of the link don’t need to be the same. Use text-decoration-color to make them completely different colours or make the underline a lighter shade of the link colour.

Here’s a link with a translucent underline.

That’s quite a difference with just a few CSS declarations:

text-underline-offset: 0.2em;
text-decoration-thickness: 1px;
text-decoration-color: oklch(from currentColor l c h / 50%);

If that still isn’t subtle enough for you, you could even use text-decoration-style to make the underline dotted or dashed, but that might be a step too far.

Here’s a link with a dotted underline.

Whatever you decide, I hope you’ll see that underlines aren’t the enemy of good design. They’re an opportunity.

You should use underlines to keep your links accessible. But you should also use CSS to make those underlines beautiful.

CSS Intelligence: Speculating On The Future Of A Smarter Language — Smashing Magazine

This is a really thoughtful look at the evolution of CSS and the ever-present need to balance power with learnability.

Polishing your typography with line height units | WebKit

I should be using the lh and rlh units more enough—they’re supported across the board!

Hiding elements that require JavaScript without JavaScript :: dade

This is clever: putting CSS inside a noscript element to hide anything that requires JavaScript.

Cascading Layouts | OddBird

A workshop on resilient CSS layouts

Oh, hell yes!

Do not hesitate—sign yourself up to this series of three online workshops by Miriam. This is the quickest to level up your working knowledge of the most powerful parts of CSS.

By the end of this you’re going to feel like Neo in that bit of The Matrix when he says “I know kung-fu!” …except kung-fu isn’t very useful for building resilient and maintainable websites, whereas modern CSS absolutely is.

Building WebSites With LLMS - Jim Nielsen’s Blog

And by LLMS I mean: (L)ots of (L)ittle ht(M)l page(S).

I really like this approach: using separate pages instead of in-page interactions. I remember Simon talking about how great this works, and that was a few years back, before we had view transitions.

I build separate, small HTML pages for each “interaction” I want, then I let CSS transitions take over and I get something that feels better than its JS counterpart for way less work.