.video-container {
  display: flex;
  flex-wrap: wrap;
}
.video-item {
  width: 510px;
  height: 400px;
  margin: 10px;
  border: 1px solid #ccc;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.video {
  width: 100%;
  height: 100%;
}