Curl Top Right Hover Effect
The top right corner of the button peels over on hover like a page, showing its lighter back and a soft shadow. A clip-path cuts the corner while a gradient square plays the folded flap.
Also known as: hvr-curl-top-right, folded corner button css, page peel hover.
HTML
<button class="hfx-curl-top-right"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M14 3H7a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V8z"/><path d="M14 3v5h5M9 13h6M9 17h4"/></svg>Read the report</button>
CSS
.hfx-curl-top-right {
--c: var(--hfx-color, #3b82f6);
display: inline-flex;
align-items: center;
gap: 0.5em;
padding: 0.7em 1.6em;
border-radius: 0.5em;
font: 600 var(--hfx-size, 16px) system-ui, sans-serif;
cursor: pointer;
border: 0;
background: var(--c);
color: #fff;
position: relative;
clip-path: polygon(0 0, 100% 0, 100% 0, 100% 100%, 0 100%);
transition: clip-path 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);}
.hfx-curl-top-right svg {
width: 1.1em;
height: 1.1em;
}
/* the flap: the cut corner mirrored across the fold, lighter like the back of the paper */
.hfx-curl-top-right::before {
content: "";
position: absolute;
top: 0;
right: 0;
width: 1.4em;
height: 1.4em;
border-bottom-left-radius: 0.3em;
background: linear-gradient(225deg, transparent 50%, color-mix(in srgb, var(--c) 45%, #fff) 50%, color-mix(in srgb, var(--c) 8%, #fff) 90%);
box-shadow: -0.12em 0.12em 0.25em rgb(0 0 0 / 0.3);
transform: scale(0);
transform-origin: 100% 0;
transition: transform 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);
}
.hfx-curl-top-right:is(:hover, :focus-visible) {
clip-path: polygon(0 0, calc(100% - 1.4em) 0, 100% 1.4em, 100% 100%, 0 100%);
}
.hfx-curl-top-right:is(:hover, :focus-visible)::before {
transform: scale(1);
}
@media (prefers-reduced-motion: reduce) {
.hfx-curl-top-right, .hfx-curl-top-right *, .hfx-curl-top-right::before, .hfx-curl-top-right::after, .hfx-curl-top-right *::before, .hfx-curl-top-right *::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.