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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchUse text-shadow to glow text, box-shadow to glow a rectangular element, and filter: drop-shadow() when the glow should follow a transparent image or irregular silhouette. Layer subtle shadows for a softer halo, and keep text readable without relying on the glow.
Choose the right CSS glow
| Technique | Best for | Shape followed | Main controls |
|---|---|---|---|
text-shadow |
Text and headings | Letter shapes | Horizontal and vertical offsets, blur radius, color; multiple comma-separated shadows |
box-shadow |
Cards, buttons, panels | Element’s rectangular frame | Offsets, blur, spread, color; can be inset |
filter: drop-shadow() |
Transparent PNGs, SVGs, irregular artwork | Nontransparent pixels in the input image | Offsets, blur, color; no spread or inset |
The distinction matters for logos and icons: box-shadow can glow around the image element’s rectangular box, including transparent corners. drop-shadow() follows the image’s alpha silhouette instead. See MDN’s references for text-shadow, box-shadow, and drop-shadow().
Make glowing text
text-shadow adds shadows to text. Set both offsets to zero for an even halo, then layer a close shadow with wider, blurrier shadows to build a luminous effect:
.neon-text {
color: #fff;
text-shadow:
0 0 0.15em #fff,
0 0 0.45em #00eaff,
0 0 1em #00aaff;
}Each layer is written as horizontal offset, vertical offset, blur radius, and color. The first layer creates a tight core; the later layers extend the halo. Increase blur or add a layer for a broader glow, and adjust the colors to suit the background. Excessive blur can make letter edges harder to distinguish, so judge the result at the size and background where the text will appear.
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Glow a button, card, or panel
Use box-shadow when the glow belongs to an element’s rectangular frame. A close shadow plus a wider halo is a useful starting point:
.glow-card {
box-shadow:
0 0 0.25rem #00eaff,
0 0 1rem #00aaff;
}In each shadow, the first two values are the horizontal and vertical offsets, followed by blur, with color last. Add a spread value when you need the shadow to extend or contract beyond the frame; box-shadow also supports inset shadows, which appear inside the element. For a glow that should sit evenly around a button, keep the offsets at zero. Consult MDN’s box-shadow reference for the property’s syntax and options.
Make a glow follow an image or icon
For transparent artwork, use filter: drop-shadow() so the glow tracks its visible silhouette rather than a rectangular box. For example:
.glowing-icon {
filter: drop-shadow(0 0 3px magenta);
}The function takes offsets, blur, and color, but does not provide the spread or inset controls available with box-shadow. It can also be applied to other elements; MDN’s filter guide shows a glow on a heading: h1 { color: midnightblue; filter: drop-shadow(0 0 3px magenta); }. See MDN’s guide to using filter effects for context.
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Keep glow effects readable and comfortable
Check contrast without counting the glow
A glow is decoration, not a substitute for readable foreground and background colors. Check the text against its actual background: WCAG 2.2 specifies a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text, subject to the criterion’s exceptions. Use the W3C WAI explanation of Contrast (Minimum) for the full requirements.
Honor reduced-motion preferences
If a glow pulses or changes over time, turn off nonessential animation when a visitor requests reduced motion:
@media (prefers-reduced-motion: reduce) {
.pulsing-glow {
animation: none;
}
}MDN explains the prefers-reduced-motion media query and its accessibility use.
Troubleshoot common glow problems
- The glow looks like a rectangle around an icon. The effect is following the element’s box. Try
filter: drop-shadow()if you want it to follow the visible alpha silhouette. - The text looks blurred or difficult to read. Reduce the blur or remove an outer shadow layer, and verify the text/background contrast independently of the effect.
- The glow is displaced to one side. Check the first two values in the shadow: they control horizontal and vertical offsets. Use zero offsets for an even halo.
- You need an inset or spread effect on an irregular image.
drop-shadow()does not have spread or inset parameters. Usebox-shadowif the rectangular frame is acceptable, or keep the silhouette-following effect without those controls.
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