.wave-container {
  width: 300px;
  height: 200px;
  position: relative;
  background-color: #ffffff;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
  overflow: hidden;
}

.wave {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 0;
  background-color: #3498db;
  opacity: 0.7;
}