* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body, html {
  background-color: #000;
}

.ad-container {
  position: relative;
  width: 100%;
  height: 100%;
}

video {
  width: 500px;
  height: 500px;
  object-fit: cover;
}