Square Radio with Diagonal Fill
Square radios in an export menu. The accent wipes across the box corner to corner with an animated clip-path, then a small white square springs into the middle. Native inputs, no extra markup.
Also known as: square radio button, radio button square, square radio button css, boxed radio input.
HTML
<div class="rad-square-radio-diagonal" role="radiogroup" aria-label="Export format"> <label><input type="radio" name="rad-square-radio-diagonal" value="png" checked><span class="rad-square-radio-diagonal-name">PNG</span><span class="rad-square-radio-diagonal-meta">2.4 MB</span></label> <label><input type="radio" name="rad-square-radio-diagonal" value="svg"><span class="rad-square-radio-diagonal-name">SVG</span><span class="rad-square-radio-diagonal-meta">186 KB</span></label> <label><input type="radio" name="rad-square-radio-diagonal" value="pdf"><span class="rad-square-radio-diagonal-name">PDF</span><span class="rad-square-radio-diagonal-meta">1.1 MB</span></label> </div>
CSS
.rad-square-radio-diagonal {
--c: var(--rad-color, #3b82f6);
font-size: var(--rad-size, 18px);
display: grid;
gap: 0.25em;
width: 11em;
font-family: system-ui, sans-serif;
line-height: 1.2;
}
.rad-square-radio-diagonal label {
display: grid;
grid-template-columns: auto 1fr auto;
align-items: center;
gap: 0.7em;
padding: 0.45em 0.55em;
border-radius: 0.45em;
cursor: pointer;
transition: background-color 0.2s ease;
}
.rad-square-radio-diagonal label:hover {
background: color-mix(in srgb, currentColor 5%, transparent);
}
.rad-square-radio-diagonal input {
-webkit-appearance: none;
appearance: none;
display: grid;
place-items: center;
box-sizing: border-box;
width: 1.2em;
height: 1.2em;
margin: 0;
border: 0.11em solid color-mix(in srgb, currentColor 35%, transparent);
border-radius: 0.2em;
background: transparent;
color: inherit;
font: inherit;
cursor: pointer;
transition: border-color 0.2s ease, transform 0.15s ease;
}
.rad-square-radio-diagonal input::before,
.rad-square-radio-diagonal input::after {
content: "";
grid-area: 1 / 1;
}
.rad-square-radio-diagonal input::before {
width: 100%;
height: 100%;
background: var(--c);
clip-path: polygon(0 0, 0 0, 0 0);
transition: clip-path 0.22s cubic-bezier(0.65, 0, 0.35, 1);
}
.rad-square-radio-diagonal input::after {
width: 0.38em;
height: 0.38em;
border-radius: 0.06em;
background: #fff;
transform: scale(0) rotate(45deg);
transition: transform 0.2s ease;
}
.rad-square-radio-diagonal label:hover input:not(:checked) {
border-color: color-mix(in srgb, var(--c) 60%, transparent);
}
.rad-square-radio-diagonal input:checked {
border-color: var(--c);
}
.rad-square-radio-diagonal input:checked::before {
clip-path: polygon(0 0, 200% 0, 0 200%);
transition-duration: 0.35s;
}
.rad-square-radio-diagonal input:checked::after {
transform: scale(1) rotate(0deg);
transition: transform 0.4s cubic-bezier(0.34, 1.7, 0.64, 1) 0.2s;
}
.rad-square-radio-diagonal input:active {
transform: scale(0.88);
}
.rad-square-radio-diagonal input:focus-visible {
outline: 0.12em solid var(--c);
outline-offset: 0.18em;
}
.rad-square-radio-diagonal-name {
font-size: 0.9em;
font-weight: 600;
letter-spacing: 0.02em;
}
.rad-square-radio-diagonal-meta {
font: 0.75em ui-monospace, SFMono-Regular, Menlo, monospace;
color: color-mix(in srgb, currentColor 50%, transparent);
transition: color 0.2s ease;
}
.rad-square-radio-diagonal label:has(:checked) .rad-square-radio-diagonal-meta {
color: var(--c);
}
@media (prefers-reduced-motion: reduce) {
.rad-square-radio-diagonal *,
.rad-square-radio-diagonal *::before,
.rad-square-radio-diagonal *::after {
transition-duration: 0.01ms !important;
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
}
}
@media (prefers-reduced-motion: reduce) {
.rad-square-radio-diagonal, .rad-square-radio-diagonal *, .rad-square-radio-diagonal::before, .rad-square-radio-diagonal::after, .rad-square-radio-diagonal *::before, .rad-square-radio-diagonal *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Customizing this snippet
- Color: set
--rad-coloron the element or a parent. Currently previewing#3b82f6. - Size: set
--rad-size. Every other dimension is inem, so the whole thing scales together. Currently previewing18px. - 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.