body {
  margin: 0;
  padding: 0;
  background: #1a1a1a;
  color: #fff;
  font-family: 'Courier New', Courier, monospace;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  transition: background 0.5s ease;
}

.container {
  text-align: center;
  max-width: 600px;
}

button {
  padding: 15px 30px;
  font-size: 16px;
  border: none;
  background: crimson;
  color: white;
  cursor: pointer;
  border-radius: 5px;
  transition: transform 0.2s;
}

button:hover {
  transform: scale(1.1);
}

/* Scary mode */
.scary {
  background: black;
  background-image: url('scary-face.jpg');
  height: 75%;
  width: 70%;
  background-size: cover;
  background-position: center;
  color: red;
  animation: shake 0.33s infinite;
  
}

.scary h1,
.scary p,
.scary button {
  display: inline-flex;
}

/* Shake animation */
@keyframes shake {
  0% { transform: translate(1px, 1px); }
  25% { transform: translate(-1px, -2px); }
  50% { transform: translate(-3px, 0px); }
  75% { transform: translate(3px, 2px); }
  100% { transform: translate(1px, -1px); }
}