body {
  background: #121212;
  color: white;
  font-family: sans-serif;
  margin: 0;
  padding: 0;
}
header {
  padding: 1em;
  background: #1db954;
  color: #000;
  font-weight: bold;
}
#playlist {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
  padding: 10px;
}
.track {
  background: #222;
  padding: 10px;
  cursor: pointer;
  transition: 0.3s;
}
.track:hover {
  background: #1db954;
  color: #000;
}
footer {
  padding: 10px;
  background: #333;
  position: sticky;
  bottom: 0;
}