*{
    margin:0;
    padding:0;
    box-sizing: border-box;
}

body {
  background: #1e1e2e;
  color: #fff;
  font-family: Arial, sans-serif;
  text-align: center;
  margin: 0;
  padding: 20px;
}

h1 {
  margin-bottom: 20px;
}

.controls {
  margin-bottom: 20px;
}

button, select, input[type="number"]{
  padding: 10px 15px;
  margin: 5px;
  border: none;
  border-radius: 5px;
  background: pink;
  color: white;
  font-size: 14px;
  cursor: pointer;
}

button:hover, select:hover {
  background: pink;
}

#bars {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  height: 400px;
  width: 100%;
  border: 1px solid #444;
  background: #2a2a3d;
  margin-top: 20px;
}

.bar {
  margin: 0 2px;
  background: cyan;
  width: 15px;
  transition: 0.7s all ease;
}