Split Double Border Button
Two outlines sit exactly on top of each other and read as one. On hover they split apart diagonally into two colors with a springy overshoot. Two bordered pseudo-elements, and only transform moves.
Also known as: offset border button, double outline hover, misregistered print effect.
HTML
<button class="btn-double-border-split">View work</button>
CSS
.btn-double-border-split {
--c: var(--btn-color, #3b82f6);
display: inline-flex;
align-items: center;
justify-content: center;
gap: 0.5em;
font: 600 var(--btn-size, 18px)/1.2 system-ui, sans-serif;
cursor: pointer;
--c2: color-mix(in srgb, var(--c) 45%, #d946ef);
position: relative;
padding: 0.8em 1.8em;
border: 0;
border-radius: 0.4em;
background: transparent;
color: var(--c);}
.btn-double-border-split::before,
.btn-double-border-split::after {
content: "";
position: absolute;
inset: 0;
border: 2px solid var(--c2);
border-radius: inherit;
pointer-events: none;
transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.btn-double-border-split::after { border-color: var(--c); }
.btn-double-border-split:is(:hover, :focus-visible)::before { transform: translate(0.3em, 0.3em); }
.btn-double-border-split:is(:hover, :focus-visible)::after { transform: translate(-0.3em, -0.3em); }
@media (prefers-reduced-motion: reduce) {
.btn-double-border-split, .btn-double-border-split *, .btn-double-border-split::before, .btn-double-border-split::after, .btn-double-border-split *::before, .btn-double-border-split *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Customizing this snippet
- Color: set
--btn-coloron the element or a parent. Currently previewing#3b82f6. - Base size: set
--btn-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.