Film Strip Border
A frame of film between two rows of sprocket holes that roll past as if it were running through a projector. Each row is one wide gradient strip, slid by exactly one hole per loop with transform.
Also known as: film strip css, filmstrip border animation, movie film border.
Scene 24
HTML
<div class="bdr-film-strip-border"> <span class="bdr-film-strip-border-holes"></span> <span class="bdr-film-strip-border-holes"></span> <span class="bdr-film-strip-border-frame">Scene 24</span> </div>
CSS
.bdr-film-strip-border {
--c: var(--bdr-color, #3b82f6);
font-size: var(--bdr-size, 16px);
position: relative;
display: grid;
place-items: center;
width: 15em;
height: 8.5em;
border-radius: 1em;
font-family: system-ui, sans-serif;
font-weight: 600;
overflow: hidden;
border-radius: 0.3em;
background: color-mix(in srgb, var(--c) 8%, #0e0e11);
box-shadow: inset 0 0 0 1px color-mix(in srgb, #fff 12%, transparent);
}
.bdr-film-strip-border-holes {
position: absolute;
top: 0.4em;
left: 0;
width: calc(100% + 1.2em);
height: 0.6em;
background: linear-gradient(90deg, #e7e5e4 0 0.62em, transparent 0) 0.3em 0 / 1.2em 100% repeat-x;
animation: bdr-film-strip-border-roll 0.5s linear infinite;
}
.bdr-film-strip-border-holes + .bdr-film-strip-border-holes {
top: auto;
bottom: 0.4em;
}
.bdr-film-strip-border-frame {
position: absolute;
inset: 1.35em 0.7em;
display: grid;
place-items: center;
border-radius: 0.2em;
background: linear-gradient(160deg, color-mix(in srgb, var(--c) 55%, #fff), var(--c) 60%, color-mix(in srgb, var(--c) 70%, #000));
color: #fff;
letter-spacing: 0.04em;
animation: bdr-film-strip-border-flicker 0.3s steps(2) infinite;
}
@keyframes bdr-film-strip-border-roll {
to { transform: translateX(-1.2em); }
}
@keyframes bdr-film-strip-border-flicker {
50% { opacity: 0.93; }
}
@media (prefers-reduced-motion: reduce) {
.bdr-film-strip-border, .bdr-film-strip-border *, .bdr-film-strip-border::before, .bdr-film-strip-border::after, .bdr-film-strip-border *::before, .bdr-film-strip-border *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Customizing this snippet
- Color: set
--bdr-coloron the element or a parent. Currently previewing#3b82f6. - Base size: set
--bdr-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.