.mainvideo-wrapper {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 aspect ratio */
  overflow: hidden; margin-bottom: 50px;
}

.mainvideo-bg {
	 border-radius: 20px;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center bottom;
}