Hover-reveal Sidebar

<div class="nuda-hoverbar">
  <button class="nuda-hoverbar__btn">
    <span class="nuda-hoverbar__ic">📊</span>
    <span class="nuda-hoverbar__label">Stats</span>
  </button>
  <!-- More items -->
</div>

.nuda-hoverbar {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 8px;
  background: rgba(255,255,255,.02);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: 12px;
  width: fit-content;
}

.nuda-hoverbar__btn {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0;
  padding: 8px 10px;
  width: 36px;
  background: transparent;
  border: 0;
  color: #a0a0a8;
  border-radius: 8px;
  cursor: pointer;
  overflow: hidden;
  transition: width .35s cubic-bezier(.16,1,.3,1),background .2s,gap .35s,color .2s;
}

.nuda-hoverbar__btn:hover {
  width: 120px;
  gap: 10px;
  background: rgba(228,255,84,.08);
  color: #e4ff54;
}

.nuda-hoverbar__ic {
  font-size: 14px;
  flex-shrink: 0;
}

.nuda-hoverbar__label {
  font-size: 11px;
  font-weight: 500;
  white-space: nowrap;
  opacity: 0;
  transform: translateX(-8px);
  transition: opacity .35s ease .1s,transform .35s ease .1s;
}

.nuda-hoverbar__btn:hover .nuda-hoverbar__label {
  opacity: 1;
  transform: translateX(0);
}