body {
  text-align: center;
}
#visualizer {
  height: 50vh;
  display: flex;
  align-items: flex-end;
}
.bar {
  width: 100%;
  height: 100%;
  margin: 1px;
  display: inline-block;
}

button[type="button"] {
  margin-bottom: 2px;
}