Icon Halo

<!-- Icon Halo — a soft ring of light breathes behind an icon -->
<div class="nuda-ne2-halo" role="img" aria-label="Notifications">
  <span class="nuda-ne2-halo__ring" aria-hidden="true"></span>
  <svg class="nuda-ne2-halo__icon" viewBox="0 0 24 24" fill="none" aria-hidden="true">
    <path d="M12 2a6 6 0 0 0-6 6v3.586l-1.707 1.707A1 1 0 0 0 5 15h14a1 1 0 0 0 .707-1.707L18 11.586V8a6 6 0 0 0-6-6Z" fill="currentColor" />
    <path d="M9.5 18a2.5 2.5 0 0 0 5 0h-5Z" fill="currentColor" />
  </svg>
</div>

.nuda-ne2-halo {
  position: relative;
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nuda-ne2-halo__ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: radial-gradient(circle,rgba(228,255,84,.55),transparent 70%);
  filter: blur(2px);
  animation: _nuda-ne2halo 3s ease-in-out infinite;
}

.nuda-ne2-halo__icon {
  position: relative;
  z-index: 1;
  width: 26px;
  height: 26px;
  color: #fbffe0;
  filter: drop-shadow(0 0 4px rgba(228,255,84,.8));
}

@keyframes _nuda-ne2halo {
  0%,100% {
    transform: scale(.85);
    opacity: .55;
  }
  50% {
    transform: scale(1.15);
    opacity: 1;
  }
}

@media (prefers-reduced-motion:reduce) {
  .nuda-ne2-halo__ring {
    animation: none;
    transform: scale(1);
    opacity: .8;
  }
}