15 Pure CSS Loading Animations
Floor-by-Floor
A vertical luxury-building loader. Floors light up bottom-to-top like an elevator passing each level, room silhouettes flicker on inside, and a penthouse glow crowns the building when `.ready` is added. Turns waiting time into an architectural narrative — perfect for residential developments and high-end real estate.
Floor-by-Floor the 5th of 15 designs in the 15 Pure CSS Loading Animations collection. The design pairs CSS styling with a small amount of JavaScript for interactivity. Copy the HTML, CSS and JavaScript panels below into your project — the JS is self-contained, has zero dependencies, and is safe to drop into any framework (React, Vue, Svelte, plain HTML). The design honours prefers-reduced-motion and uses real semantic markup, so it ships accessibility-ready out of the box.
Live preview
The code
<figure class="fb-loader" role="status" aria-label="Loading building tour">
<span class="fb-building" aria-hidden="true">
<span class="fb-roof"></span>
<span class="fb-penthouse">
<span class="fb-pent-light"></span>
</span>
<span class="fb-floor" data-floor="6"
><span class="fb-room"></span><span class="fb-room"></span><span class="fb-room"></span
></span>
<span class="fb-floor" data-floor="5"
><span class="fb-room"></span><span class="fb-room"></span><span class="fb-room"></span
></span>
<span class="fb-floor" data-floor="4"
><span class="fb-room"></span><span class="fb-room"></span><span class="fb-room"></span
></span>
<span class="fb-floor" data-floor="3"
><span class="fb-room"></span><span class="fb-room"></span><span class="fb-room"></span
></span>
<span class="fb-floor" data-floor="2"
><span class="fb-room"></span><span class="fb-room"></span><span class="fb-room"></span
></span>
<span class="fb-floor" data-floor="1"
><span class="fb-room"></span><span class="fb-room"></span><span class="fb-room"></span
></span>
<span class="fb-base"></span>
</span>
<figcaption class="fb-caption">Touring residences…</figcaption>
</figure> .fb-loader {
position: relative;
width: 110px;
height: 200px;
margin: 0;
padding: 0;
display: grid;
place-items: end center;
font-family: system-ui, sans-serif;
}
.fb-building {
position: relative;
width: 84px;
display: flex;
flex-direction: column;
border-radius: 4px 4px 0 0;
filter: drop-shadow(0 12px 24px rgba(0, 0, 0, 0.55));
}
.fb-roof {
height: 4px;
background: linear-gradient(90deg, transparent 8%, #d4af37 8%, #d4af37 92%, transparent 92%);
border-radius: 2px 2px 0 0;
margin-bottom: 1px;
}
.fb-penthouse {
position: relative;
height: 22px;
background: linear-gradient(180deg, #1f2433 0%, #161b2a 100%);
border: 1px solid rgba(212, 175, 55, 0.25);
border-bottom: 0;
display: grid;
place-items: center;
}
.fb-pent-light {
width: 60%;
height: 8px;
border-radius: 2px;
background: rgba(255, 212, 121, 0.08);
transition:
background 0.6s ease,
box-shadow 0.6s ease;
}
.fb-floor {
position: relative;
height: 22px;
background: linear-gradient(180deg, #1a1f2e 0%, #14182a 100%);
border: 1px solid rgba(255, 255, 255, 0.04);
border-bottom: 0;
display: grid;
grid-template-columns: repeat(3, 1fr);
gap: 4px;
padding: 4px 6px;
box-sizing: border-box;
}
.fb-room {
background: rgba(255, 255, 255, 0.03);
border-radius: 1.5px;
transition:
background 0.4s ease,
box-shadow 0.4s ease;
}
.fb-base {
height: 6px;
background: #2a1f1a;
border-radius: 0 0 4px 4px;
}
.fb-floor[data-floor="1"] .fb-room {
animation: fbWindow 7s ease-in-out infinite;
animation-delay: 0s;
}
.fb-floor[data-floor="2"] .fb-room {
animation: fbWindow 7s ease-in-out infinite;
animation-delay: 0.7s;
}
.fb-floor[data-floor="3"] .fb-room {
animation: fbWindow 7s ease-in-out infinite;
animation-delay: 1.4s;
}
.fb-floor[data-floor="4"] .fb-room {
animation: fbWindow 7s ease-in-out infinite;
animation-delay: 2.1s;
}
.fb-floor[data-floor="5"] .fb-room {
animation: fbWindow 7s ease-in-out infinite;
animation-delay: 2.8s;
}
.fb-floor[data-floor="6"] .fb-room {
animation: fbWindow 7s ease-in-out infinite;
animation-delay: 3.5s;
}
.fb-floor[data-floor="1"] .fb-room:nth-child(2) {
animation-delay: 0.15s;
}
.fb-floor[data-floor="1"] .fb-room:nth-child(3) {
animation-delay: 0.3s;
}
.fb-floor[data-floor="2"] .fb-room:nth-child(2) {
animation-delay: 0.85s;
}
.fb-floor[data-floor="2"] .fb-room:nth-child(3) {
animation-delay: 1s;
}
.fb-floor[data-floor="3"] .fb-room:nth-child(2) {
animation-delay: 1.55s;
}
.fb-floor[data-floor="3"] .fb-room:nth-child(3) {
animation-delay: 1.7s;
}
.fb-floor[data-floor="4"] .fb-room:nth-child(2) {
animation-delay: 2.25s;
}
.fb-floor[data-floor="4"] .fb-room:nth-child(3) {
animation-delay: 2.4s;
}
.fb-floor[data-floor="5"] .fb-room:nth-child(2) {
animation-delay: 2.95s;
}
.fb-floor[data-floor="5"] .fb-room:nth-child(3) {
animation-delay: 3.1s;
}
.fb-floor[data-floor="6"] .fb-room:nth-child(2) {
animation-delay: 3.65s;
}
.fb-floor[data-floor="6"] .fb-room:nth-child(3) {
animation-delay: 3.8s;
}
.fb-caption {
position: absolute;
bottom: -22px;
left: 50%;
transform: translateX(-50%);
font-size: 10px;
letter-spacing: 0.16em;
text-transform: uppercase;
font-weight: 600;
color: #d4af37;
white-space: nowrap;
animation: fbCap 2.6s ease-in-out infinite;
}
.fb-loader.ready .fb-room {
animation: none;
background: #ffd479;
box-shadow:
0 0 4px rgba(255, 212, 121, 0.55),
inset 0 0 3px rgba(255, 212, 121, 0.45);
}
.fb-loader.ready .fb-pent-light {
background: #ffd479;
box-shadow:
0 0 14px rgba(255, 212, 121, 0.7),
inset 0 0 8px rgba(255, 212, 121, 0.5);
}
.fb-loader.ready .fb-caption {
display: none;
}
@media (prefers-reduced-motion: reduce) {
.fb-room,
.fb-caption {
animation: none;
}
.fb-room {
background: rgba(255, 212, 121, 0.45);
}
}
@keyframes fbWindow {
0%,
5% {
background: rgba(255, 255, 255, 0.03);
box-shadow: none;
}
15%,
60% {
background: #ffd479;
box-shadow:
0 0 4px rgba(255, 212, 121, 0.55),
inset 0 0 3px rgba(255, 212, 121, 0.45);
}
80%,
100% {
background: rgba(255, 255, 255, 0.03);
box-shadow: none;
}
}
@keyframes fbCap {
0%,
100% {
opacity: 0.5;
}
50% {
opacity: 1;
}
} // Drives the elevator/penthouse "ready" reveal. Replace with your real load trigger.
document.querySelectorAll(".fb-loader").forEach(function (b) {
var ready = false;
function tick() {
ready = !ready;
b.classList.toggle("ready", ready);
setTimeout(tick, ready ? 2400 : 5400);
}
setTimeout(tick, 5400);
});