Blur In On Scroll
Comes into focus as it scrolls into view: a filter blur drops to zero while it fades in and rises a little. Striking on hero images and section titles; filter is heavier than opacity.
Also known as: blur in on scroll css, focus in on scroll, scroll reveal blur animation.
Blur
HTML
<div class="kfa-blur-in-on-scroll">Blur</div>
CSS
.kfa-blur-in-on-scroll {
--c: var(--kfa-color, #3b82f6);
font-size: var(--kfa-size, 16px);
display: grid;
place-items: center;
width: 5.5em;
height: 5.5em;
border-radius: 1em;
background: var(--c);
color: #fff;
font-family: system-ui, sans-serif;
font-weight: 700;
box-shadow: 0 0.6em 1.4em -0.6em color-mix(in srgb, var(--c) 70%, transparent);
animation: kfa-blur-in-on-scroll-in 1s cubic-bezier(0.25, 1, 0.5, 1) backwards;
}
/* scroll-driven where supported: the keyframes follow the element into the viewport */
@supports (animation-timeline: view()) {
.kfa-blur-in-on-scroll {
animation:
kfa-blur-in-on-scroll-in ease-out both,
kfa-blur-in-on-scroll-in 1s cubic-bezier(0.25, 1, 0.5, 1) backwards;
animation-timeline: view(), auto;
animation-range: entry 0% cover 35%, normal;
}
}
@keyframes kfa-blur-in-on-scroll-in {
from { opacity: 0; filter: blur(0.5em); transform: translateY(1em) scale(1.04); }
}
@media (prefers-reduced-motion: reduce) {
.kfa-blur-in-on-scroll, .kfa-blur-in-on-scroll *, .kfa-blur-in-on-scroll::before, .kfa-blur-in-on-scroll::after, .kfa-blur-in-on-scroll *::before, .kfa-blur-in-on-scroll *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Customizing this snippet
- Color: set
--kfa-coloron the element or a parent. Currently previewing#3b82f6. - Base size: set
--kfa-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.