🌊 Wave Loader

<div class="wave-bars">
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
</div>

.wave-bars {
  display: flex;
  gap: 0.25rem;
  align-items: center;
  height: 40px;
}
.wave-bars span {
  width: 6px;
  height: 100%;
  background: linear-gradient(180deg, #667eea 0%, #764ba2 100%);
  border-radius: 3px;
  animation: wave 1.2s ease-in-out infinite;
}
.wave-bars span:nth-child(1) { animation-delay: 0s; }
.wave-bars span:nth-child(2) { animation-delay: 0.1s; }
.wave-bars span:nth-child(3) { animation-delay: 0.2s; }
.wave-bars span:nth-child(4) { animation-delay: 0.3s; }
.wave-bars span:nth-child(5) { animation-delay: 0.4s; }
@keyframes wave {
  0%, 100% { transform: scaleY(0.3); }
  50% { transform: scaleY(1); }
}

<div class="wave-circle"></div>

.wave-circle {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  position: relative;
}
.wave-circle::before,
.wave-circle::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 3px solid #667eea;
  border-radius: 50%;
  animation: wave-circle 2s ease-out infinite;
}
.wave-circle::after {
  animation-delay: 1s;
}
@keyframes wave-circle {
  0% {
    transform: scale(0.5);
    opacity: 1;
  }
  100% {
    transform: scale(1.5);
    opacity: 0;
  }
}

<div class="wave-ring"></div>

.wave-ring {
  width: 60px;
  height: 60px;
  border: 4px solid transparent;
  border-top-color: #667eea;
  border-right-color: #764ba2;
  border-radius: 50%;
  animation: spin 1.5s linear infinite;
  position: relative;
}
.wave-ring::before {
  content: '';
  position: absolute;
  top: 4px;
  left: 4px;
  right: 4px;
  bottom: 4px;
  border: 3px solid transparent;
  border-top-color: #f093fb;
  border-radius: 50%;
  animation: spin 2s linear infinite reverse;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}