html, body {
  margin: 0px;
  padding: 0px;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

button {
  font-weight: bold;
  font-size: 20px;
  padding: 5px;
  min-width: 40px;
}
label {
  font-weight: bold;
  font-size: 20px;
}
h1 {
  margin: 0.2em;
}