Pulsar

Envelope

CSS

Two concentric rectangular frames with dimension line callouts that slowly expand outward before resetting at their boundary.

Tier
CSS
Dependencies
None
Duration
4.2 s, loops
Categories
Backgrounds and ambient
Use cases
Security and trust, Ambient background
Industries
SaaS and software, Security and identity
Style
Technical · light stroke
Set
perimeter
Tags
geometricscaleambientminimalstroke

Companion assets

The same artwork, not animated. Derived from the entry’s own resting state, so it matches exactly.

Animated
CSS tier
Static vector
Envelope, not animated
Download SVG

Code

animation.svg

<svg xmlns="http://www.w3.org/2000/svg" fill="none" aria-hidden="true" class="pulsar pulsar-perimeter-envelope" data-pulsar="perimeter-envelope" viewBox="0 0 160 96"><rect width="56" height="32" x="52" y="32" stroke="currentColor" opacity=".35"></rect><g class="perimeter-envelope-outer"><rect width="76" height="48" x="42" y="24" fill="var(--pulsar-accent, currentColor)" fill-opacity=".05" stroke="var(--pulsar-accent, currentColor)" stroke-width="1.5"></rect><path stroke="var(--pulsar-accent, currentColor)" d="M38 28v-8h8"></path><path stroke="var(--pulsar-accent, currentColor)" d="M122 28v-8h-8"></path><path stroke="var(--pulsar-accent, currentColor)" d="M38 68v8h8"></path><path stroke="var(--pulsar-accent, currentColor)" d="M122 68v8h-8"></path></g><g class="perimeter-envelope-dims"><line x1="80" x2="80" y1="12" y2="18" stroke="currentColor" opacity=".6"></line><line x1="80" x2="80" y1="78" y2="84" stroke="currentColor" opacity=".6"></line><line x1="28" x2="34" y1="48" y2="48" stroke="currentColor" opacity=".6"></line><line x1="126" x2="132" y1="48" y2="48" stroke="currentColor" opacity=".6"></line></g></svg>

animation.css

.pulsar-perimeter-envelope {
  display: block;
  overflow: visible;
}
.pulsar-perimeter-envelope .perimeter-envelope-outer {
  animation: perimeter-envelope-expand-anim 4200ms ease-in-out infinite;
  transform-origin: 80px 48px;
}
.pulsar-perimeter-envelope .perimeter-envelope-dims {
  animation: perimeter-envelope-dims-anim 4200ms ease-in-out infinite;
  transform-origin: 80px 48px;
}

@keyframes perimeter-envelope-expand-anim {
  0%,
  100% {
    transform: scale(0.94);
    opacity: 0.7;
  }
  50% {
    transform: scale(1.08);
    opacity: 1;
  }
}

@keyframes perimeter-envelope-dims-anim {
  0%,
  100% {
    transform: scale(0.92);
  }
  50% {
    transform: scale(1.1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .pulsar-perimeter-envelope .perimeter-envelope-outer,
  .pulsar-perimeter-envelope .perimeter-envelope-dims {
    animation: none;
  }
}

From this family15 in Perimeter

See the family