body{
    padding: 0px ;
    margin: 0px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
   
}

header {
   /*
   background-position: right; 
   background-image:url(background.png);
   background-repeat: no-repeat;*/
    padding: 0px ;
    margin: 12px; 
}

/*class kann ofter verwendet werde*/
.mitte {
    display: flex;
    justify-content: center;
    align-items: center;
}
/* Id kann nur bei ein div verwendet werden*/
#teaser {
width: 100%;
height: 300px;
}

#teaser img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/*wenn Bildschirm bereite min 800 px denn ...*/
@media screen and (min-width:800px){
    #teaser {
        height: 600px;
    }
}

/*Navigationsleiten nach unten und oben mitgeschoben wird*/
nav, footer {
    position: sticky;
    top: 0px;
    background-color: rgba(4, 4, 51, 0.699);
    backdrop-filter: blur(8px);
}

nav ul, footer ul {
    list-style: none;
    margin: 0;
    padding: 0;
    padding-top: 16px;
    padding-bottom: 16px;
}

nav ul li a, footer ul li a  {
    /*font-weight: bold;*/
    font-weight: 600;
    color: white;
    padding: 24px;
}

nav  a:link, nav a:visited , footer a:link, nav a:visited {
    color: rgb(255, 255, 255);
    text-decoration: none;
}

nav li:hover , footer li:hover {
    background-color: rgb(7, 6, 7);
    text-decoration: none;
}

nav a:hover , footer a:hover{
    color: white;
}

nav li a:hover:after 
{
  text-decoration: none;
}

 section{
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 16px;
    padding-right: 16px;
 }