Inbox Header

<div class="nuda-inboxhd">
  <div class="nuda-inboxhd__title">
    Inbox
    <span class="nuda-inboxhd__count">12</span>
  </div>
  <button class="nuda-inboxhd__mark">Mark all read</button>
</div>

.nuda-inboxhd {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  background: rgba(255,255,255,.02);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: 10px;
  width: 100%;
  max-width: 280px;
}

.nuda-inboxhd__title {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #fafafa;
  font-size: 14px;
  font-weight: 700;
}

.nuda-inboxhd__count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  background: #ff5e7a;
  color: #fafafa;
  border-radius: 99px;
  font-size: 10px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  animation: _cntBob .5s cubic-bezier(.34,1.56,.64,1);
}

.nuda-inboxhd__mark {
  background: transparent;
  border: 0;
  color: #a0a0a8;
  font-size: 11px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  transition: background .2s,color .2s;
}

.nuda-inboxhd__mark:hover {
  background: rgba(255,255,255,.04);
  color: #e4ff54;
}

@keyframes _cntBob {
  0% {
    transform: scale(0);
  }
  60% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
  }
}

@media (prefers-reduced-motion:reduce) {
  .nuda-inboxhd__count {
    animation: none;
  }
}