Back to CSS Button Groups Orbital FAB Pure CSS
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HTML
<div class="cbgp-orbit">
  <input type="checkbox" id="cbgp-orbit-t" class="cbgp-orbit-toggle" aria-hidden="true" />
  <label
    for="cbgp-orbit-t"
    class="cbgp-orbit-main"
    tabindex="0"
    role="button"
    aria-label="Open create menu"
  >
    <span class="cbgp-orbit-plus" aria-hidden="true">+</span>
    <span class="cbgp-orbit-ring" aria-hidden="true"></span>
  </label>
  <a class="cbgp-orbit-child cbgp-orbit-c1" href="javascript:void(0)" aria-label="New document">
    <svg viewBox="0 0 24 24" aria-hidden="true">
      <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z" />
      <polyline points="14 2 14 8 20 8" />
    </svg>
  </a>
  <a class="cbgp-orbit-child cbgp-orbit-c2" href="javascript:void(0)" aria-label="New folder">
    <svg viewBox="0 0 24 24" aria-hidden="true">
      <path d="M22 19a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h5l2 3h9a2 2 0 0 1 2 2z" />
    </svg>
  </a>
  <a class="cbgp-orbit-child cbgp-orbit-c3" href="javascript:void(0)" aria-label="Upload file">
    <svg viewBox="0 0 24 24" aria-hidden="true">
      <path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4M17 8l-5-5-5 5M12 3v12" />
    </svg>
  </a>
</div>
CSS
.cbgp-orbit { position: relative; width: 60px; height: 60px; }
.cbgp-orbit-toggle {
  position: absolute;
  width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.cbgp-orbit-main, .cbgp-orbit-child {
  position: absolute;
  display: flex; align-items: center; justify-content: center;
  text-decoration: none;
  cursor: pointer;
  user-select: none;
}
.cbgp-orbit-main {
  z-index: 2;
  bottom: 0; left: 0;
  width: 56px; height: 56px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #00ffe0 0%, #006e62 100%);
  color: #001f1c;
  box-shadow:
    0 0 0 0 rgba(0,255,224,0.4),
    0 8px 22px rgba(0,255,224,0.35),
    inset 0 -3px 6px rgba(0,0,0,0.25);
  transition: transform 0.4s cubic-bezier(.34,1.56,.64,1), box-shadow 0.3s;
}
.cbgp-orbit-plus {
  font: 800 28px/1 ui-monospace, monospace;
  transition: transform 0.4s cubic-bezier(.34,1.56,.64,1);
}
.cbgp-orbit-ring {
  position: absolute; inset: -4px;
  border-radius: 50%;
  border: 2px solid #00ffe0;
  opacity: 0;
  transition: opacity 0.3s, transform 0.6s cubic-bezier(.65,0,.35,1);
}
.cbgp-orbit-toggle:focus-visible + .cbgp-orbit-main { outline: 2px solid #ff5af1; outline-offset: 4px; }
.cbgp-orbit-toggle:checked + .cbgp-orbit-main {
  box-shadow:
    0 0 0 4px rgba(0,255,224,0.18),
    0 8px 28px rgba(0,255,224,0.55),
    inset 0 -3px 6px rgba(0,0,0,0.25);
}
.cbgp-orbit-toggle:checked + .cbgp-orbit-main .cbgp-orbit-plus { transform: rotate(135deg); }
.cbgp-orbit-toggle:checked + .cbgp-orbit-main .cbgp-orbit-ring { opacity: 1; transform: scale(1.4); }
.cbgp-orbit-child {
  z-index: 1;
  bottom: 8px; left: 8px;
  width: 40px; height: 40px;
  border-radius: 50%;
  background: rgba(8,10,18,0.92);
  border: 1.5px solid rgba(0,255,224,0.4);
  color: #00ffe0;
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transform: scale(0.4);
  transition:
    transform 0.5s cubic-bezier(.34,1.56,.64,1),
    opacity 0.3s,
    background 0.2s;
}
.cbgp-orbit-child svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.cbgp-orbit-toggle:checked ~ .cbgp-orbit-child {
  opacity: 1;
  pointer-events: auto;
}
/* Curved arc deployment: each child arrives at a different angle around the FAB */
.cbgp-orbit-toggle:checked ~ .cbgp-orbit-c1 { transform: translate(0, -68px) scale(1); }
.cbgp-orbit-toggle:checked ~ .cbgp-orbit-c2 { transform: translate(50px, -50px) scale(1); }
.cbgp-orbit-toggle:checked ~ .cbgp-orbit-c3 { transform: translate(68px, 0) scale(1); }
.cbgp-orbit-child:hover {
  background: rgba(0,255,224,0.18);
  border-color: #00ffe0;
  color: #c8fffa;
}
@media (prefers-reduced-motion: reduce) {
  .cbgp-orbit-main, .cbgp-orbit-child, .cbgp-orbit-plus, .cbgp-orbit-ring { transition: none; }
}