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

.body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
}

.base_div {
  background-color: black;
  max-width: 150px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding-right: 20px;
  padding-left: 20px;
  margin-bottom: 20px;
}

.light {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  margin-top: 10px;
  margin-bottom: 10px;
}

.red {
  background-color: red;
}

.yellow {
  background-color: yellow;
}

.green {
  background-color: green;
}

button {
  font-size: 3em;
}

.next {
  margin-bottom: 20px;
}

.next,
.auto {
  padding: 10px;
}

.lightOn {
  opacity: 1;
}

.lightOff {
  opacity: 0;
}