body {
  font-family: sans-serif;
  text-align: center;
  background-color: #f4f4f4;
}

#visualization-container {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  height: 400px;
  margin-top: 20px;
}

.bar {
  margin: 0 2px;
  background-color: steelblue;
  width: 20px;
}

.controls {
  margin: 20px;
}