Arbitrary value support in Tailwind CSS allows you to use any custom value with any utility where it makes sense. It's a powerful feature introduced in Tailwind CSS v2.2. This means you're no longer limited by the values defined in your configuration file and can use any value you need right in your HTML.
For example, if you want to set a width that isn't available in Tailwind CSS classes, you can now do so like this:
In the above example,
[123px] is an arbitrary value that sets
width of the element to
Arbitrary values with modifiers
You can also use arbitrary values with responsive design, hover state, etc:
<div class="hover:w-[123px] md:w-[456px]">[...]</div>
In this example, the
width of the element will be
456px on medium screens (
md:w-[456px]), and the
width will change to
123px on hover
This feature also supports other units, not just pixels. You can use rem units, percentages, etc. Additionally, you can use this feature with most of the utility classes in Tailwind CSS, such as padding, margin, translate, scale, rotate, skew, grid, etc.
Arbitrary values give you a lot more flexibility and power when using Tailwind CSS. They allow you to have the benefits of utility-first CSS while still being able to use any value you need, right in your markup.
Fixing the Hero Image using arbitrary values
In the previous lesson, we finished our fullscreen Hero Image. On large screens, it fills the available space perfectly, down to the pixel.
However, there is a problem in the mobile view - there is a small, empty space at the bottom.
That's because Navbar is a flexible component and adapts to its content. In the mobile view, the Navbar collapses and hides most of its elements, which reduces its height.
And as you remember, we set our Hero Image
margin-top: -56px; ,
because that's the height of the Navbar on large screens.
So we need to make sure that on other screen sizes the height of the Navbar
stays the same, which is
This is the perfect opportunity to use arbitrary values.
min-h-[56px] to Navbar.
min-h- class defines the minimum height for a given
[56px] is the height given in the form of
arbitrary values that we want to maintain on all screens.
<!-- Navbar --> <nav class="flex-no-wrap relative flex min-h-[56px] w-full items-center justify-between bg-white py-2 shadow-md shadow-black/5 dark:bg-neutral-600 dark:shadow-black/10 lg:flex-wrap lg:justify-start lg:py-4" data-te-navbar-ref> [...] </nav>
Now it's pixel-perfect on every screen size 🤩
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Author of hundreds of articles on programming, business, marketing and productivity. In the past, an educator working with troubled youth in orphanages and correctional facilities.