body {
  font-family: Arial;
  margin: 0;
  background: #0f172a;
  color: white;
  text-align: center;
}

header {
  background: #1e293b;
  padding: 30px;
}

.card {
  background: #1e293b;
  margin: 20px auto;
  padding: 20px;
  width: 60%;
  border-radius: 10px;
}

ul {
  list-style: none;
  padding: 0;
}

li {
  padding: 5px;
}

button {
  padding: 10px;
  border: none;
  background: #38bdf8;
  cursor: pointer;
  margin-top: 10px;
}

footer {
  margin-top: 30px;
  padding: 20px;
  background: #1e293b;
}