Split Button

<div class="nuda-split">
  <button class="nuda-split__main">Save</button>
  <button class="nuda-split__toggle">▾</button>
  <ul class="nuda-split__menu">
    <li class="nuda-split__item">Save as draft</li>
    <li class="nuda-split__item">Save &amp; publish</li>
  </ul>
</div>

.nuda-split {
  position: relative;
  display: inline-flex;
}

.nuda-split__main {
  background: #e4ff54;
  color: #0a0a0a;
  border: none;
  border-radius: 8px 0 0 8px;
  padding: .5rem .9rem;
  font-size: .8rem;
  font-weight: 600;
  cursor: pointer;
}

.nuda-split__toggle {
  background: #c8e23c;
  color: #0a0a0a;
  border: none;
  border-left: 1px solid rgba(0,0,0,.15);
  border-radius: 0 8px 8px 0;
  padding: .5rem .6rem;
  font-size: .7rem;
  cursor: pointer;
}

.nuda-split__menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: .4rem;
  list-style: none;
  padding: .35rem;
  min-width: 160px;
  background: #141414;
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 10px;
  animation: _splitIn .2s ease-out;
}

.nuda-split__item {
  padding: .5rem .6rem;
  border-radius: 6px;
  font-size: .8rem;
  color: #cfcfcf;
  cursor: pointer;
  white-space: nowrap;
}

.nuda-split__item:hover {
  background: rgba(228,255,84,.1);
  color: #fafafa;
}

@keyframes _splitIn {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

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