* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
body {
  font-family: Arial, sans-serif;
  padding: 20px;
}
.video-container {
  margin-top: 20px;
}
.tab-container {
  display: flex;
  margin-bottom: 10px;
}
.tab {
  padding: 10px 20px;
  background: #f1f1f1;
  cursor: pointer;
  border: 1px solid #ddd;
  margin-right: 5px;
}
.tab.active {
  background: #4CAF50;
  color: white;
}
video {
  width: 100%;
  display: none;
}
video.active {
  display: block;
}