body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(to right, #0f2027, #203a43, #2c5364);
  color: #fff;
  text-align: center;
}

.container {
  padding: 20px;
}

h1 {
  margin-bottom: 20px;
}

.controls {
  margin-bottom: 20px;
}

.controls select,
.controls input[type="range"],
.controls button {
  margin: 0 10px;
  padding: 8px 12px;
  border: none;
  border-radius: 6px;
  font-size: 14px;
}

.controls button {
  background-color: #1abc9c;
  color: white;
  cursor: pointer;
}

.controls button:hover {
  background-color: #16a085;
}

.bar-container {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  height: 400px;
  margin-top: 30px;
  border-radius: 10px;
  background-color: #1e1e2f;
  padding: 10px;
  overflow: hidden;
}

.bar {
  background-color: #3498db;
  margin: 0 2px;
  border-radius: 4px 4px 0 0;
  transition: height 0.2s, background-color 0.2s;
}