body {
  /* Bild-URL */
  background-image: url('sky.jpg');
  
  /* Bild zentrieren */
  background-position: center center;
  
  /* Bild nicht wiederholen */
  background-repeat: no-repeat;
  
  /* Bild an Viewport anpassen (Vollbild) */
  background-size: cover;
  
  /* Bild fixieren beim Scrollen */
  background-attachment: fixed;
  
  /* Mindesthöhe, um sicherzugehen, dass es den ganzen Bereich abdeckt */
  min-height: 100vh;
  margin: 0;
}

nav ul {
  display: flex;
  flex-direction: column;
} 

nav li {
  list-style: none;
  margin: 0.5em;
  padding: 0;
  font-size: 1.5em;  
}

@media (min-width: 45em) {
  nav ul {	
    flex-direction: row;  
  }
  nav li {
    font-size: 1em;
  }  
}

a {		
	color: white;
}

p {		
	padding-left: 3em;
}

nav a {
	display: block;
	padding: 0.4em;
	text-decoration: none;
	font-weight: bold;
	border: thin solid var(--background-color);
	border-radius: .5em;
	color: var(--accent1-color);
	background-color: var(--background-color);
	transition: all .25s ease-in;
}

[aria-current=page] {
	background: var(--accent2-color);
}

nav a:focus,
nav a:hover,
nav a:active {
	color: var(--background-color);
	background-color: var(--accent1-color);
}

:root {
	--background-color: midnightblue;
	--accent1-color: gold;
	--accent2-color: darkred;
	--text-color: black;
}

h1 {
	font-size: 1.5rem;
	position: relative;
	padding-left: 3em;
	color: red;
}

h3 {	
	position: relative;
	padding-left: 3em;
	color: yellow;
}

h4 {	
	position: relative;
	padding-left: 3em;
	color: white;
}

h1:before {
	position: absolute;
	left: 0;
	content: "";
	width: 2rem;
	border: thin solid transparent;
	aspect-ratio: 1/1;	
	background-size: cover;
}

html {
	background: transparent!important;
	--blue: #337599;
	--green: #93b946;
	--red: #c82f04;
	--yellow: #dfac20;
	--lightblue: #d6e3eb;
	--lightgreen: #ebf5d7;
	--lightred: #ffebe6;
	--lightyellow: #f9eed2;
}

.hinweis {
	border-inline-start: thick solid var(--red);
	padding-inline-start: 1em;
}

kbd {
	background: #f9f9f9 linear-gradient(to bottom, #eee, #f9f9f9, #eee) repeat scroll 0 0;
	border: thin solid #aaa;
	border-radius: 2px;
	box-shadow: 1px 2px 2px #ddd;
	font-family: inherit;
	font-size: 0.9em;
	padding: 0 0.5em;
}