summary {
	  list-style: none;
  position: relative;
  padding: 10px 50px 10px 30px;
  cursor: pointer;
  background-color: #696969;
}
summary::-webkit-details-marker {
	display: none;
}
summary:before {
	content: "¡Ü";
}
details[open] summary:before,
summary details[open] summary:before {
	content: "¡Ý";
}


iframe.youtube-16-9 {
width: 100%;
height: auto;
aspect-ratio: 16 / 9;
}