body {
  background: #0b1c2c;
  color: #cfe8ff;
  font-family: Arial, sans-serif;
  text-align: center;
}

/* header */
.header {
  background: #123a5c;
  padding: 20px;
}

/* buttons */
button {
  background: #1f5f8b;
  color: white;
  border: none;
  padding: 10px;
  margin: 10px;
  cursor: pointer;
}

/* broadcast box */
.broadcast {
  margin-top: 20px;
  padding: 20px;
  border: 2px solid #1f5f8b;
}

/* TV screen */
.tv {
  border: 3px solid #1f5f8b;
  margin: 30px auto;
  padding: 40px;
  width: 300px;
  background: black;
  color: #00ff9f;
  font-family: monospace;
}

/* alert screen */
.alert {
  background: black;
  color: red;
  padding: 40px;
  font-family: monospace;
}

/* CRT overlay */
body::after {
  content: "";
  position: fixed;
  width: 100%;
  height: 100%;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    rgba(0,0,0,0.2) 0px,
    rgba(0,0,0,0.2) 2px,
    transparent 2px,
    transparent 4px
  );
}