body {
  margin: 0;
  font-family: sans-serif;
  background: #111;
  color: white;
}
#container {
  display: flex;
  height: 100vh;
}
#sidebar {
  width: 60px;
  background: #222;
  overflow-y: auto;
  padding: 5px;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.button {
  width: 40px;
  height: 40px;
  margin: 6px 0;
  background: #444;
  color: white;
  border: 2px solid #888;
  border-radius: 6px;
  font-size: 1em;
  cursor: pointer;
}
.button:hover {
  background-color: #666;
}
#main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #000;
  position: relative;
}
video {
  width: 95%;
  height: auto;
  max-height: 85%;
}
#fullscreenBtn {
  margin-top: 10px;
  padding: 6px 12px;
  font-size: 0.9em;
  border-radius: 6px;
  border: none;
  background-color: #444;
  color: white;
  cursor: pointer;
}
#fullscreenBtn:hover {
  background-color: #666;
}

#loading {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.8);
  display: flex;
  justify-content: center;
  align-items: center;
  color: white;
  font-size: 2em;
  z-index: 9999;
}