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CSS accent-color Form Previewer

For years, tinting a checkbox or radio button to match your brand meant hiding the native control and rebuilding it with custom markup, pseudo-elements, and JavaScript. The CSS accent-color property replaced all of that with one line, and this tool shows you exactly what it does to real controls before you commit. Pick an accent color with the picker, the hex field, or a swatch, and watch it apply live to a checkbox, a pair of radio buttons, a range slider, and a progress bar, rendered side by side in both a light and a dark card so you can confirm it reads well in either color scheme. The dark and light previews use the CSS color-scheme property, which is what lets the browser pick a contrasting check-mark automatically, so what you see here matches how it behaves in a real themed page. The output is the single declaration you need, ready to drop on :root for site-wide form theming.

Swatches

CSS

Only checkboxes, radio buttons, range sliders, and progress bars are tinted by accent-color. Browsers pick a readable check-mark color automatically.
Light scheme
Dark scheme
How to Theme Form Controls with accent-color
  1. Choose your accent - Use the color picker, type a hex value, or click one of the swatches to set the accent color.
  2. Watch the live controls - The checkbox, radios, range slider, and progress bar update instantly in both preview cards.
  3. Compare light and dark - Check that the color works in both schemes; the browser adjusts the check-mark contrast for you.
  4. Copy the CSS - Copy the one-line accent-color declaration and paste it onto :root for site-wide theming, or onto a specific form.
Why This Tool?
 Documentation for accent-color is plentiful, but it tends to show a single static example, and what people actually want to know is whether their brand color looks good across all four tintable controls in both light and dark mode. Seeing a checkbox, radio, range, and progress bar together, themed live, answers that in a glance and saves a round trip through a real build. It also makes the property's limits obvious: only those four control types are affected, so you will not be surprised when a select or a button ignores the color. 
 Pairing accent-color with color-scheme is the detail most examples omit and the reason this tool renders dedicated light and dark cards. When color-scheme is set, the browser renders form controls with scheme-appropriate backgrounds and automatically chooses a check-mark color with enough contrast against your accent, which is why a mid-tone accent can look right in both modes without any extra work from you. 
 This is native, accessible form styling with zero JavaScript and no fragile custom controls. The previewer simply removes the guesswork so you can choose an accent confidently and ship it as one line of CSS.