body {
  background-color: hsl(0, 0%, 90%);
  align-items: center;
  justify-content: center;
}

.container {
  max-width: 600px;
  margin-top: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 30px;
  border: 5px solid;
  border-radius: 50px;
  background-color: white;
}

#display {
  font-size: 5rem;
  font-family: monospace;
  font-weight: bold;
  color: hsl(0, 0%, 30%);
  text-shadow: 2px, 2px, 2px, hsl(0, 0%, 0%, 0.75);
  margin-bottom: 25px;
}

#controls button {
  font-size: 1.5rem;
  font-weight: bold;
  padding: 10px 20px;
  margin: 5px;
  min-width: 125px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  color: white;
  transition: background-color 0.5s ease;
}

#startBtn {
  background-color: hsl(115, 100%, 40%);
}
#startBtn {
  background-color: hsl(115, 100%, 30%);
}

#stoptBtn {
  background-color: hsl(10, 90%, 50%);
}
#stopBtn {
  background-color: hsl(10, 90%, 60%);
}

#resettBtn {
  background-color: hsl(205, 90%, 40%);
}
#resetBtn {
  background-color: hsl(205, 90%, 50%);
}