CSS Animation

The infinite scroll effect works by duplicating the entire logo strip and animating both copies in sequence. Here’s how the HTML structure looks:

<div class="id-logo-scroller">
  <div class="id-logo-scroller__track">
    <div class="id-logo-scroller__group">
      <!-- Logo 1, Logo 2, Logo 3 ... -->
    </div>
    <div class="id-logo-scroller__group">
      <!-- Logo 1, Logo 2, Logo 3 ... (duplicate) -->
    </div>
  </div>
</div>

The Animation

The .id-logo-scroller__track element uses display: flex to lay the two groups side by side. A CSS @keyframes animation translates the track from 0% to -50% of its total width (which is exactly one group’s width). When the animation loops, the second group has moved to where the first group started, creating a perfectly seamless transition.

Because the animation uses translateX() on the GPU-accelerated transform property, it runs at 60fps without causing layout reflows or repaints. There is no JavaScript animation library involved — just a single CSS keyframe rule.

Why Duplication Works

The two groups contain identical content. At the exact moment the first group scrolls fully out of view, the second group occupies its original position. The animation resets and the cycle begins again — the viewer never sees a gap, jump, or flash.

Overflow Clipping

The outer .id-logo-scroller container has overflow: hidden, so only the visible portion of the track is shown. The duplicated content sitting off-screen to the right is invisible until it scrolls into view.