Pulse Ring Button
On hover a ring radiates outward from the button's edge and fades, once per second, like a sonar ping. It stops the moment the cursor leaves.
Also known as: ping button, radar button hover.
HTML
<button class="hfx-pulse-ring">Notify me</button>
CSS
.hfx-pulse-ring {
--c: var(--hfx-color, #3b82f6);
font-size: var(--hfx-size, 16px);
display: inline-flex;
align-items: center;
gap: 0.5em;
padding: 0.7em 1.6em;
border-radius: 0.5em;
font: 600 1em system-ui, sans-serif;
cursor: pointer;
position: relative;
border: 0;
background: var(--c);
color: #fff;}
.hfx-pulse-ring::after {
content: "";
position: absolute;
inset: 0;
border-radius: inherit;
box-shadow: 0 0 0 0 color-mix(in srgb, var(--c) 70%, transparent);
pointer-events: none;
}
.hfx-pulse-ring:hover::after {
animation: hfx-pulse-ring-ping 1s ease-out infinite;
}
@keyframes hfx-pulse-ring-ping {
to { box-shadow: 0 0 0 0.9em transparent; }
}
@media (prefers-reduced-motion: reduce) {
.hfx-pulse-ring, .hfx-pulse-ring *, .hfx-pulse-ring::before, .hfx-pulse-ring::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Customizing this snippet
- Color: set
--hfx-coloron the element or a parent. Currently previewing#3b82f6. - Base size: set
--hfx-size. Every other dimension is inem, so the whole thing scales together. Currently previewing16px. - 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.