body {
  background: radial-gradient(circle at center, #111, #000);
  font-family: 'Arial', sans-serif;
  color: gold;
  text-align: center;
}

.container {
  padding: 20px;
  max-width: 800px;
  margin: auto;
}

.number-ball {
  background: gold;
  color: black;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin: 5px;
  font-weight: bold;
}