header {
	background-color: #212121;
	color: #fff;
	padding: 20px;
	display: flex;
	justify-content: space-between;
	align-items: center;
}

nav ul ul {
	display: none;
}

nav ul li:hover > ul {
	display: block;
}


h1 {
	margin: 0;
	font-size: 36px;
}

h2 {
  color: #F43C1F;
  text-shadow: 2px 2px 2px #000000;
  font-size: 24px;
  margin-top: 10px;
}  

nav ul {
	list-style: none;
	margin: 0;
	padding: 0;
	display: flex;
}

nav li {
	margin: 0 10px;
}

nav a {
	color: #fff;
	text-decoration: none;
	font-size: 18px;
}

nav a:hover {
	text-decoration: underline;
}
.promociones {
	display: flex;
	flex-wrap: wrap;
	justify-content: space-between;
	align-items: center;
	margin: 50px auto;
	max-width: 800px;
}

.promociones img {
	display: block;
	max-width: 200px;
	height: auto;
	margin: 10px;
	border-radius: 5px;
	box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.3);

.youtube {
  text-align: center;
  margin-top: 20px;
}

.youtube a {
  display: block;
  width: 100%;
  height: 0;
  padding-bottom: 56.25%;
  position: relative;
  overflow: hidden;
  border: 4px solid #8bc34a;
}

.youtube a img {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}

.youtube a:hover img {
  transform: scale(1.1);
}

.youtube a span {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 24px;
  font-weight: bold;
  opacity: 0;
  transition: opacity 0.2s ease-in-out;
}

.youtube a:hover span {
  opacity: 1;
}