body{background-color:lightgray;}
.rtitle{color:navy;}
.rdescription{color:darkgray;}
.video-container {
  width: 100%; /* Spans full width of its parent */
  aspect-ratio: 16 / 9; /* Maintains standard widescreen format */
}

.video-container iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: block; /* Removes sneaky bottom whitespace gaps */
}