The library

Techniques, not templates

Every trick recreated from the source video as a live, self-contained demo. Search, filter, open, steal.

1 / 7

Squircles in CSS: corner-shape Cuts the Corner

Chromium 139 and up only. Safari and Firefox drop the declaration and keep the border-radius, which is the rounded box you already ship, so the fallback costs nothing. A round corner is a quarter circle: it meets the straight edge at an angle. corner-shape says which curve cuts the corner instead, and squircle keeps curving into the edge, the shape phone home screens have used for a decade. It needs a border-radius to work on, since that is what says how far the corner is cut. Every named value is one point on a single curve: bevel is superellipse(0), round is superellipse(1), squircle is superellipse(2), and negatives scoop the corner inwards. notch and square sit at the two infinities.

cssborder-radiusuino-jscornersshapesiconscorner-shape

2 / 7

Inverting Headline: White Minus the Backdrop

One line, and the headline stops needing a colour. mix-blend-mode: difference subtracts the two layers channel by channel, so white text hands back the exact inverse of whatever is under it: black on a bright sheet, white on a dark hero, cyan over magenta, all of it per pixel and without a second copy of the text. Three things bound it. Mid grey is the blind spot, since 128 against 255 comes back as 127, the grey it was meant to beat. Only white is a true invert, because any other colour has channels it cannot fully subtract. And a blended element reads everything painted beneath it in its stacking context, so isolation: isolate on the scene is what stops the headline from subtracting the whole page.

csscontrasttypographytextcolorblend-modeno-jshero

3 / 7

Seamless Marquee: Two Copies, Half a Slide

A marquee loops with no visible jump when the run is repeated twice and slid by exactly half the track: half the track is one whole copy, so at the end copy two stands where copy one started and the restart has nothing to show. Three details decide it. The travel has to be translateX(-50%), a percentage of the element being transformed, so it tracks the run's width on its own. The track needs width: max-content, or it wraps at the parent's width. And the spacing belongs to the items, not the track: a gap sits between the two copies as well as inside them, so a 34px track gap puts one copy 17px out of step, while padding-inline-end leaves the halves identical.

animationcssno-jsmarqueetransformkeyframesticker

4 / 7

Pulsing Status Dot: The Ring Is a Box Shadow

A pulsing status dot is usually three elements: a wrapper, a ring, and the dot. It needs one. box-shadow paints outside the border box and takes no part in layout, so the halo is a second shape the element already owns: grow the spread from 0 to 14px while the alpha runs out and the ring swells past the dot, moving nothing around it. One span, two keyframes. The shadow reads color-mix(in srgb, var(--dot) 70%, transparent), so green, red, amber and blue all run the same pulse, and it inherits border-radius, so the circle and the rounded square differ by that one property. cubic-bezier(0, 0, .35, 1) throws the spread out at once and then crawls, which is what a ripple looks like; linear reads as a blinking outline.

animationcssbox-shadowno-jskeyframesstatuspulse

5 / 7

Scroll-Driven Animation: The Scroll Is the Clock

A scroll-driven animation is an ordinary @keyframes animation with its clock swapped out: animation-timeline: view() replaces time with the element's own trip through its scroller. Nothing fires, nothing needs teardown, and it runs on the compositor. animation-range picks which slice of that trip the keyframes get: cover, entry, exit, contain. Rings and cards pin with position: sticky and read scroll(), since view() times an element against travel a pinned box no longer has. Rows stagger inside entry, because animation-delay is a length of time and this timeline has none. Two traps: animation-timeline goes after the animation shorthand, which resets it, and @supports has to land everything finished where scroll timelines are missing.

animationcssscrollno-jsanimation-timelinescroll-drivenanimation-range

6 / 7

CSS Anchor Positioned Tooltip with Popover

A tooltip that automatically positions itself relative to a button using pure CSS Anchor Positioning and the Popover API. It stays visible and adapts to screen edges without any JavaScript or z-index conflicts.

cssresponsivetooltippopoveranchor positioningutilityno-js

7 / 7

Segmented Control Sliding Pill

A pure CSS segmented control with a smoothly sliding and resizing pill indicator, using radio inputs and labels for interaction. The pill animates its position and width with a springy cubic-bezier transition.

animationcsstransitionsformsno-jssegmented-control