:root {
  --color_A: #2e073f; /* Dark purple */
  --color_B: #7a1cac; /* Medium purple */
  --color_C: #ad49e1; /* Light purple */
  --color_D: #ebdef8; /* Light blueish */
  --color_E: #ffffff; /* White */
}

body {
  background-color: var(--color_A);
  color: var(--color_E);
  font-family: Arial, sans-serif;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

h1 {
  color: var(--color_D);
  font-size: 2.5rem;
  margin-bottom: 20px;
  text-shadow: 1px 1px var(--color_B);
}

#demo {
  background-color: var(--color_B);
  color: var(--color_E);
  font-size: 3rem;
  text-align: center;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

button {
  background-color: var(--color_C);
  color: var(--color_E);
  border: none;
  padding: 10px 20px;
  font-size: 1.2rem;
  cursor: pointer;
  border-radius: 5px;
  margin-top: 20px;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: var(--color_B);
}