15 Pure CSS Loading Animations
Heartbeat Line
An SVG heartbeat waveform scrolls horizontally in a continuous loop — an inline data URI with a CSS translateX animation.
Heartbeat Line the 15th of 15 designs in the 15 Pure CSS Loading Animations collection. The design is implemented in pure CSS — no JavaScript required. Copy the HTML and CSS panels below into your project. Because the demo is pure CSS, it works in any framework or templating engine you happen to use. The design honours prefers-reduced-motion and uses real semantic markup, so it ships accessibility-ready out of the box.
Live preview
The code
<div class="hb-wrap"> <div class="hb-line"></div> </div>
.hb-wrap {
width: 120px;
height: 40px;
overflow: hidden;
}
.hb-line {
width: 200%;
height: 100%;
background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 40'%3E%3Cpolyline points='0,20 30,20 40,5 50,35 60,5 70,35 80,20 110,20 120,20 150,20 160,5 170,35 180,5 190,35 200,20' fill='none' stroke='%23ff6c8a' stroke-width='2.5'/%3E%3C/svg%3E")
repeat-x center/50% 100%;
animation: hbeat 1s linear infinite;
}
@keyframes hbeat {
to {
transform: translateX(-50%);
}
}
@media (prefers-reduced-motion: reduce) {
.hb-wrap,
.hb-wrap * {
animation: none !important;
}
}