Star Favorite Checkbox
An outlined star that spins in a fifth of a turn, fills with the accent and throws five sparks from between its points. Unchecking just drains the fill, so the fanfare only plays on a new favorite.
Also known as: star checkbox css, favorite star toggle, star bookmark checkbox.
HTML
<label class="chk-star-favorite">
<input type="checkbox">
<span class="chk-star-favorite-icon">
<span class="chk-star-favorite-sparks"><i style="--i:0"></i><i style="--i:1"></i><i style="--i:2"></i><i style="--i:3"></i><i style="--i:4"></i></span>
<svg viewBox="0 0 24 24" aria-hidden="true"><path d="M12 3l2.7 5.6 6.1.9-4.4 4.3 1 6.1L12 17l-5.4 2.9 1-6.1-4.4-4.3 6.1-.9z"/></svg>
</span>
<span class="chk-star-favorite-text">Add to favorites</span>
</label>CSS
.chk-star-favorite {
--c: var(--chk-color, #3b82f6);
font-size: var(--chk-size, 24px);
position: relative;
display: inline-flex;
align-items: center;
gap: 0.6em;
line-height: 1.3;
cursor: pointer;
-webkit-user-select: none;
user-select: none;
-webkit-tap-highlight-color: transparent;
}
.chk-star-favorite input {
position: absolute;
inset: 0;
width: 100%;
height: 100%;
margin: 0;
opacity: 0;
cursor: pointer;
z-index: 1;
}
.chk-star-favorite-icon {
position: relative;
display: grid;
place-items: center;
width: 1.6em;
height: 1.6em;
border-radius: 0.4em;
}
.chk-star-favorite-icon svg {
width: 1.45em;
height: 1.45em;
fill: transparent;
stroke: color-mix(in srgb, currentColor 38%, transparent);
stroke-width: 1.7;
stroke-linejoin: round;
transition: fill 0.25s ease, stroke 0.25s ease;
}
.chk-star-favorite-sparks {
position: absolute;
inset: 0;
}
.chk-star-favorite-sparks i {
position: absolute;
left: 50%;
top: 50%;
width: 0.12em;
height: 0.32em;
margin: -0.16em -0.06em;
border-radius: 1em;
background: var(--c);
transform: rotate(calc(var(--i) * 72deg + 36deg)) translateY(-0.7em) scaleY(0);
}
.chk-star-favorite-text {
transition: color 0.25s ease;
}
.chk-star-favorite input:checked ~ .chk-star-favorite-text {
color: var(--c);
}
.chk-star-favorite:hover .chk-star-favorite-icon svg {
stroke: var(--c);
}
.chk-star-favorite input:checked + .chk-star-favorite-icon svg {
fill: var(--c);
stroke: var(--c);
animation: chk-star-favorite-spin 0.6s cubic-bezier(0.34, 1.4, 0.64, 1);
}
.chk-star-favorite input:checked + .chk-star-favorite-icon .chk-star-favorite-sparks i {
animation: chk-star-favorite-spark 0.5s ease-out 0.3s both;
}
.chk-star-favorite input:focus-visible + .chk-star-favorite-icon {
outline: 0.12em solid var(--c);
outline-offset: 0.18em;
}
@keyframes chk-star-favorite-spin {
0% { transform: rotate(-72deg) scale(0.4); }
100% { transform: rotate(0deg) scale(1); }
}
@keyframes chk-star-favorite-spark {
0% { transform: rotate(calc(var(--i) * 72deg + 36deg)) translateY(-0.6em) scaleY(0); }
40% { transform: rotate(calc(var(--i) * 72deg + 36deg)) translateY(-0.95em) scaleY(1); }
100% { transform: rotate(calc(var(--i) * 72deg + 36deg)) translateY(-1.25em) scaleY(0); }
}
@media (prefers-reduced-motion: reduce) {
.chk-star-favorite, .chk-star-favorite *, .chk-star-favorite::before, .chk-star-favorite::after, .chk-star-favorite *::before, .chk-star-favorite *::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.