Neon Glow Checkbox
A neon tube checkbox on its own dark panel: checking flickers the box on like a sign warming up, draws a glowing tick and lights the label. Glow comes from box-shadow and a drop-shadow filter.
Also known as: glowing checkbox css, neon checkbox, glow checkbox.
HTML
<label class="chk-neon-checkbox">
<input type="checkbox">
<span class="chk-neon-checkbox-box">
<svg viewBox="0 0 24 24" aria-hidden="true"><path d="M5 12.5l4.5 4.5L19 7.5"/></svg>
</span>
<span class="chk-neon-checkbox-text">Night mode</span>
</label>CSS
.chk-neon-checkbox {
--c: var(--chk-color, #3b82f6);
font-size: var(--chk-size, 24px);
position: relative;
display: inline-flex;
align-items: center;
gap: 0.6em;
font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
line-height: 1.3;
cursor: pointer;
-webkit-tap-highlight-color: transparent;
--glow: color-mix(in srgb, var(--c) 55%, #fff);
gap: 0.75em;
padding: 0.75em 1.25em;
border-radius: 0.75em;
background: #0b0d17;
color: #94a3b8;
letter-spacing: 0.02em;}
.chk-neon-checkbox input {
position: absolute;
inset: 0;
width: 100%;
height: 100%;
margin: 0;
opacity: 0;
cursor: pointer;
z-index: 1;
}
.chk-neon-checkbox-box {
box-sizing: border-box;
display: grid;
place-items: center;
flex: none;
width: 1.375em;
height: 1.375em;
border: 0.1em solid color-mix(in srgb, var(--c) 80%, transparent);
border-radius: 0.3em;
box-shadow: 0 0 0 transparent, inset 0 0 0 transparent;
transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.chk-neon-checkbox-box svg {
display: block;
fill: none;
stroke-linecap: round;
stroke-linejoin: round;
width: 0.9em;
height: 0.9em;
stroke: var(--glow);
stroke-width: 3;
stroke-dasharray: 22;
stroke-dashoffset: 22;
filter: drop-shadow(0 0 0.12em var(--c));
transition: stroke-dashoffset 0.15s ease-in;
}
.chk-neon-checkbox-text {
transition: color 0.3s ease, text-shadow 0.3s ease;
}
.chk-neon-checkbox input:checked + .chk-neon-checkbox-box {
border-color: var(--glow);
box-shadow: 0 0 0.5em var(--c), inset 0 0 0.35em color-mix(in srgb, var(--c) 60%, transparent);
animation: chk-neon-checkbox-flicker 0.6s linear;
}
.chk-neon-checkbox input:checked + .chk-neon-checkbox-box svg {
stroke-dashoffset: 0;
transition: stroke-dashoffset 0.3s ease-out 0.25s;
}
.chk-neon-checkbox input:checked ~ .chk-neon-checkbox-text {
color: #fff;
text-shadow: 0 0 0.5em var(--c);
}
.chk-neon-checkbox input:focus-visible + .chk-neon-checkbox-box {
outline: 0.125em solid var(--c);
outline-offset: 0.18em;
}
@keyframes chk-neon-checkbox-flicker {
0%, 100% { opacity: 1; }
8% { opacity: 0.3; }
16% { opacity: 1; }
28% { opacity: 0.45; }
40% { opacity: 1; }
52% { opacity: 0.75; }
}
@media (prefers-reduced-motion: reduce) {
.chk-neon-checkbox, .chk-neon-checkbox *, .chk-neon-checkbox::before, .chk-neon-checkbox::after, .chk-neon-checkbox *::before, .chk-neon-checkbox *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Customizing this snippet
- Color: set
--chk-coloron the element or a parent. Currently previewing#3b82f6. - Size: set
--chk-size. Every other dimension is inem, so the whole thing scales together. Currently previewing24px. - Speed: change the duration on the
transitionoranimationshorthand. Staggered delays are relative, so they keep their rhythm. - Reduced motion: the rule at the end of the CSS turns the motion off for people who asked their OS for less of it. Keep it.