body {
  background: linear-gradient(to right, #4facfe, #00f2fe);
  font-family: sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  background-color: white;
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: 0 0 2rem rgba(0, 0, 0, 0.2);
  text-align: center;
}

h1 {
  margin-bottom: 2rem;
}

.numbers {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.number {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background-color: #eee;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.5rem;
  font-weight: bold;
}

#generate {
  background-color: #4facfe;
  color: white;
  border: none;
  padding: 1rem 2rem;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: background-color 0.2s;
}

#generate:hover {
  background-color: #00f2fe;
}

#test-results {
  margin-top: 2rem;
  padding: 1rem;
  border-radius: 0.5rem;
  background-color: #f0f0f0;
}

.test-result {
  padding: 0.5rem;
  border-bottom: 1px solid #ddd;
}

.test-result.success {
  color: green;
}

.test-result.failure {
  color: red;
}