index.css

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-weight: bold;
  text-align: center;
}

h1{
  margin-top: 10px;
  margin-bottom: 10px;
}

h2{
  font-size: 50px;
  margin-top: 0;
  margin-bottom: 20px;
}

button {
  border: none;
  padding: 20px 50px;
  color: white;
  background-color: brown;
  border-radius: 10px;
  font-size: large;
  font-weight: bold;
}

button:active {
  transform: scale(0.95);
}

#increment-btn {
  background: darkred;
}

#save-btn {
  background: darkgreen;
}