body {
  background-color: #000;
  color: #0f0;
  font-family: monospace;
  padding: 20px;
}
a { color: #0ff; }
.btn {
  padding: 10px 20px;
  background: #0f0;
  color: black;
  border: none;
  margin: 5px;
  cursor: pointer;
}
.section {
  margin-bottom: 40px;
}