.video-container {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  height: 0;
  overflow: hidden;
}

.video-container iframe,
.video-container video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

video {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
}

.video-wrapper {
  max-width: 800px;
  margin: 0 auto;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  border-radius: 12px;
  overflow: hidden;
}

/* 16:9 (widescreen) */
.ratio-16-9 {
  aspect-ratio: 16 / 9;
}

/* 4:3 (standard) */
.ratio-4-3 {
  aspect-ratio: 4 / 3;
}

/* 1:1 (square) */
.ratio-1-1 {
  aspect-ratio: 1 / 1;
}

/* 21:9 (ultra-wide) */
.ratio-21-9 {
  aspect-ratio: 21 / 9;
}

.video-overlay-container {
  position: relative;
}

.video-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.video-overlay-container:hover .video-overlay {
  opacity: 1;
}

.play-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80px;
  height: 80px;
  background-color: rgba(0, 123, 255, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
}

.play-button:hover {
  transform: translate(-50%, -50%) scale(1.1);
  background-color: rgba(0, 123, 255, 1);
}

.play-button::after {
  content: "";
  width: 0;
  height: 0;
  border-left: 20px solid white;
  border-top: 12px solid transparent;
  border-bottom: 12px solid transparent;
  margin-left: 5px;
}

.hero-video {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -1;
}

.hero-content {
  position: relative;
  z-index: 1;
  color: white;
  text-align: center;
  padding: 100px 20px;
}

.embed-container {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  max-width: 100%;
}

.embed-container iframe,
.embed-container object,
.embed-container embed {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.video-grid-item {
  position: relative;
  padding-bottom: 56.25%;
  background-color: #000;
  border-radius: 8px;
  overflow: hidden;
}

.video-grid-item video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-thumbnail {
  position: relative;
  cursor: pointer;
}

.video-thumbnail img {
  width: 100%;
  display: block;
  border-radius: 8px;
}

.video-thumbnail::after {
  content: "▶";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 60px;
  color: white;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.video-loading {
  position: relative;
  background-color: #000;
}

.video-loading::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 40px;
  height: 40px;
  margin: -20px 0 0 -20px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.video-with-caption {
  max-width: 800px;
  margin: 0 auto;
}

.video-with-caption video {
  width: 100%;
  display: block;
  border-radius: 8px 8px 0 0;
}

.video-caption {
  background-color: #f8f9fa;
  padding: 15px;
  text-align: center;
  border-radius: 0 0 8px 8px;
}

<video controls>
  <source src="video.mp4" type="video/mp4" />
  <track kind="captions" src="captions.vtt" srclang="en" label="English" />
  Your browser doesn't support video.
</video>