body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  background: #0d1117;
  color: #fff;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.center-box {
  background: #161b22;
  padding: 2rem 3rem;
  border-radius: 12px;
  box-shadow: 0 0 20px rgba(0,0,0,0.5);
  text-align: center;
}

.center-box h1 {
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
  color: #58a6ff;
}

.center-box ul {
  list-style: none;
  padding: 0;
}

.center-box li {
  margin: 0.5rem 0;
}

.center-box a {
  color: #c9d1d9;
  text-decoration: none;
  font-size: 1.1rem;
  transition: color 0.3s ease;
}

.center-box a:hover {
  color: #58a6ff;
}


/* unvisited link */
#banner-link a:link {
  color: red;
}

/* visited link */
#banner-link a:visited {
  color: red;
}

/* mouse over link */
#banner-link a:hover {
  color: #FFCCCB;
}

/* selected link */
#banner-link a:active {
  color: yellow;
}