video {
    width: 100%;
    }
h1 {font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
color: black;}
h3 {font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
color: black;
display: flex;
justify-content: center;
align-items: center}
header {margin-top: 50px ;height: 6%;
box-shadow: 0px 6px 14px -8px #0000008c;
}  
body {margin-left: 0;margin-right: 0; margin-top:0;} 
.startseite {  font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
 color: rgb(0, 0, 0);  text-decoration: none;background-color: rgba(133, 0, 0, 0.128); padding: 3px; margin-left: 20px; } 
.startseite:hover {background-color: rgba(133, 0, 0, 0.347);
    
    padding: 7px; 
    border: 2px solid rgba(133, 0, 0, 0.475) }
div {display: flex;
    justify-content: center;}