Level Up

<div class="nuda-levelup">
  <div class="nuda-levelup__rays"></div>
  <div class="nuda-levelup__num">12</div>
  <div class="nuda-levelup__copy">
    <div class="nuda-levelup__label">Level up</div>
    <div class="nuda-levelup__title">You reached level 12!</div>
  </div>
</div>

.nuda-levelup {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  background: linear-gradient(135deg,rgba(228,255,84,.1),rgba(110,231,183,.05));
  border: 1px solid rgba(228,255,84,.3);
  border-radius: 14px;
  color: #fafafa;
  width: 100%;
  max-width: 260px;
  overflow: hidden;
  animation: _lvlIn .55s cubic-bezier(.16,1,.3,1) both;
}

.nuda-levelup__rays {
  position: absolute;
  inset: -40px;
  background: repeating-conic-gradient(from 0deg,rgba(228,255,84,.06) 0deg,rgba(228,255,84,.06) 8deg,transparent 8deg,transparent 16deg);
  animation: _lvlSpin 12s linear infinite;
  pointer-events: none;
}

.nuda-levelup__num {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #09090b;
  border: 2px solid #e4ff54;
  color: #e4ff54;
  font-size: 18px;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
  z-index: 1;
  animation: _lvlNum .8s cubic-bezier(.34,1.56,.64,1);
}

.nuda-levelup__copy {
  position: relative;
  z-index: 1;
}

.nuda-levelup__label {
  color: #e4ff54;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  font-family: ui-monospace,SFMono-Regular,Menlo,monospace;
}

.nuda-levelup__title {
  font-size: 13px;
  font-weight: 700;
  margin-top: 2px;
}

@keyframes _lvlIn {
  from {
    opacity: 0;
    transform: scale(.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes _lvlSpin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes _lvlNum {
  0% {
    transform: scale(0) rotate(-90deg);
  }
  60% {
    transform: scale(1.15) rotate(10deg);
  }
  100% {
    transform: scale(1) rotate(0);
  }
}

@media (prefers-reduced-motion:reduce) {
  .nuda-levelup,.nuda-levelup__rays,.nuda-levelup__num {
    animation: none;
  }
}