Mechanical Odometer Rolling Digits
A dashboard odometer: the red tenths drum turns nonstop and each full turn carries into the next drum, with shaded cylinders. Every drum is a digit strip with its own timed roll.
Also known as: odometer css, mileage counter animation, rolling digits css, car odometer animation.
HTML
<div class="txt-mechanical-odometer" aria-label="Odometer reading 48,327.0 km">
<span class="txt-mechanical-odometer-case" aria-hidden="true">
<span class="txt-mechanical-odometer-drum">0</span><span class="txt-mechanical-odometer-drum">4</span><span class="txt-mechanical-odometer-drum">8</span><span class="txt-mechanical-odometer-drum"><span class="txt-mechanical-odometer-col"><span class="txt-mechanical-odometer-tens">23456789012</span></span></span><span class="txt-mechanical-odometer-drum"><span class="txt-mechanical-odometer-col"><span class="txt-mechanical-odometer-units">78901234567</span></span></span><span class="txt-mechanical-odometer-drum txt-mechanical-odometer-tenth"><span class="txt-mechanical-odometer-col"><span class="txt-mechanical-odometer-tenths">01234567890</span></span></span>
</span>
<span class="txt-mechanical-odometer-unit" aria-hidden="true">km</span>
</div>CSS
.txt-mechanical-odometer {
--c: var(--txt-color, #3b82f6);
font-size: calc(var(--txt-size, 32px) * 1);
font-family: system-ui, sans-serif;
font-weight: 700;
line-height: 1.2;
display: inline-flex;
align-items: flex-end;
gap: 0.35em;}
.txt-mechanical-odometer-case {
display: inline-flex;
gap: 0.06em;
padding: 0.14em;
border-radius: 0.28em;
background: #050505;
box-shadow: inset 0 0 0 1px rgb(255 255 255 / 0.08), 0 0.1em 0.3em -0.05em rgb(0 0 0 / 0.45);
font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
font-weight: 600;
font-variant-numeric: tabular-nums;
}
.txt-mechanical-odometer-drum {
position: relative;
display: inline-block;
width: 0.92em;
height: 1.3em;
line-height: 1.3em;
text-align: center;
color: #f4f4f5;
border-radius: 0.08em;
background: linear-gradient(#0a0a0a, #2a2a2a 48%, #1c1c1c 52%, #0a0a0a);
overflow: hidden;
}
/* the curve of the drum: dark top and bottom, a soft highlight above center */
.txt-mechanical-odometer-drum::after {
content: "";
position: absolute;
inset: 0;
background: linear-gradient(rgb(0 0 0 / 0.75), rgb(0 0 0 / 0) 30%, rgb(255 255 255 / 0.06) 44%, rgb(0 0 0 / 0) 60%, rgb(0 0 0 / 0.75));
pointer-events: none;
}
.txt-mechanical-odometer-tenth {
color: #fff;
background: linear-gradient(color-mix(in srgb, var(--c) 45%, #000), var(--c) 48%, color-mix(in srgb, var(--c) 80%, #000) 52%, color-mix(in srgb, var(--c) 45%, #000));
}
.txt-mechanical-odometer-col {
display: block;
height: 1.3em;
overflow: hidden;
}
.txt-mechanical-odometer-col > span {
display: block;
width: 1ch;
margin: 0 auto;
word-break: break-all;
}
.txt-mechanical-odometer-tenths { animation: txt-mechanical-odometer-tenths 6s linear infinite; }
.txt-mechanical-odometer-units { animation: txt-mechanical-odometer-units 60s infinite; }
.txt-mechanical-odometer-tens { animation: txt-mechanical-odometer-tens 600s infinite; }
.txt-mechanical-odometer-unit {
font-size: 0.5em;
font-weight: 600;
opacity: 0.55;
padding-bottom: 0.3em;
}
@keyframes txt-mechanical-odometer-tenths {
to { transform: translateY(-13em); }
}
@keyframes txt-mechanical-odometer-units {
0% { transform: translateY(0); }
9% { transform: translateY(0); animation-timing-function: linear; }
10% { transform: translateY(-1.3em); }
19% { transform: translateY(-1.3em); animation-timing-function: linear; }
20% { transform: translateY(-2.6em); }
29% { transform: translateY(-2.6em); animation-timing-function: linear; }
30% { transform: translateY(-3.9em); }
39% { transform: translateY(-3.9em); animation-timing-function: linear; }
40% { transform: translateY(-5.2em); }
49% { transform: translateY(-5.2em); animation-timing-function: linear; }
50% { transform: translateY(-6.5em); }
59% { transform: translateY(-6.5em); animation-timing-function: linear; }
60% { transform: translateY(-7.8em); }
69% { transform: translateY(-7.8em); animation-timing-function: linear; }
70% { transform: translateY(-9.1em); }
79% { transform: translateY(-9.1em); animation-timing-function: linear; }
80% { transform: translateY(-10.4em); }
89% { transform: translateY(-10.4em); animation-timing-function: linear; }
90% { transform: translateY(-11.7em); }
99% { transform: translateY(-11.7em); animation-timing-function: linear; }
100% { transform: translateY(-13em); }
100% { transform: translateY(-13em); }
}
@keyframes txt-mechanical-odometer-tens {
0% { transform: translateY(0); }
9.9% { transform: translateY(0); animation-timing-function: linear; }
10% { transform: translateY(-1.3em); }
19.9% { transform: translateY(-1.3em); animation-timing-function: linear; }
20% { transform: translateY(-2.6em); }
29.9% { transform: translateY(-2.6em); animation-timing-function: linear; }
30% { transform: translateY(-3.9em); }
39.9% { transform: translateY(-3.9em); animation-timing-function: linear; }
40% { transform: translateY(-5.2em); }
49.9% { transform: translateY(-5.2em); animation-timing-function: linear; }
50% { transform: translateY(-6.5em); }
59.9% { transform: translateY(-6.5em); animation-timing-function: linear; }
60% { transform: translateY(-7.8em); }
69.9% { transform: translateY(-7.8em); animation-timing-function: linear; }
70% { transform: translateY(-9.1em); }
79.9% { transform: translateY(-9.1em); animation-timing-function: linear; }
80% { transform: translateY(-10.4em); }
89.9% { transform: translateY(-10.4em); animation-timing-function: linear; }
90% { transform: translateY(-11.7em); }
99.9% { transform: translateY(-11.7em); animation-timing-function: linear; }
100% { transform: translateY(-13em); }
100% { transform: translateY(-13em); }
}
@media (prefers-reduced-motion: reduce) {
.txt-mechanical-odometer, .txt-mechanical-odometer *, .txt-mechanical-odometer *::before, .txt-mechanical-odometer *::after { animation: none !important; }
}
@media (prefers-reduced-motion: reduce) {
.txt-mechanical-odometer, .txt-mechanical-odometer *, .txt-mechanical-odometer::before, .txt-mechanical-odometer::after, .txt-mechanical-odometer *::before, .txt-mechanical-odometer *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Customizing this snippet
- Color: set
--txt-coloron the element or a parent. Currently previewing#3b82f6. - Font size: set
--txt-size. Every other dimension is inem, so the whole thing scales together. Currently previewing40px. - 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.