body {
  background: linear-gradient(to bottom right, #5F9EA0, #4682B4);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

form {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: row;
}

input[type="number"] {
  width: 3em;
  text-align: center;
  font-size: 1.5em;
  border: none;
  border-bottom: 1px solid white;
  margin: 0 0.5em;
  color: white;
  background-color: transparent;
  -moz-appearance: textfield;
  appearance: textfield;
  outline: none;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

p {
  font-size: 1.2em;
  color: white;
  margin-top: 1em;
}

.separator {
  color: white;
  margin: 0 0.5em;
}