html, body {
  font-family: Helvetica,Arial;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  border: 0;
}

.wrapper {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
}

#stage {
  flex: 1;
  overflow: hidden;
}

.controls {
  display: flex;
  justify-content: space-between;
  flex-shrink: 0;
  height: 100px;
  padding: 20px;
}

#score {
  font-size: 24px;
  color: darkred;
}

#buttons {
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

#buttons > button {
  margin-bottom: 5px;
}