body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #4facfe;
  height: 100vh;
  overflow: hidden;
}

#desktop {
  position: relative;
  width: 100%;
  height: 100%;
}

.window {
  width: 250px;
  height: 150px;
  background: white;
  border: 2px solid #333;
  border-radius: 8px;
  position: absolute;
  top: 50px;
  left: 50px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

.title-bar {
  background: #333;
  color: white;
  padding: 5px;
  cursor: move;
  border-radius: 6px 6px 0 0;
}

.content {
  padding: 10px;
}

#darkModeBtn {
  position: absolute;
  bottom: 20px;
  right: 20px;
  padding: 10px;
  border: none;
  border-radius: 8px;
  background: #ff6a00;
  color: white;
  cursor: pointer;
}
body.dark {
  background: #222;
  color: #eee;
}

body.dark .window {
  background: #444;
  color: #eee;
  border: 2px solid #eee;
}

body.dark .title-bar {
  background: #111;
}