body {
    width: 90em;
    margin: 0 auto;
    font-family: Tahoma, Verdana, Arial, sans-serif;
}

/* * {margin: 0;} */

iframe {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  -webkit-filter: sepia(1) blur(5px);
}
@media (min-aspect-ratio: 16/9) {
iframe {
       height: 200%; top: -50%;
/*    height: 300%; top: -100%;
       or height: 200%; top: -50%;
       or height: 400%; top: -150%; */
  }
}
@media (max-aspect-ratio: 16/9) {
iframe {
       height: 200%; top: -50%;
/*    width: 300%; left: -100%;
       or width: 200%; left: -50%;
       or width: 400%; left: -150%; */
  }
}

.oben {
    z-index: 100;
    position: relative;
    text-align: center;
}

.outline {
    text-shadow: 
    -1px -1px 0 #000000,
    1px -1px 0 #000000,
    -1px 1px 0 #000000,
    1px 1px 0 #000000,  
    -2px 0 0 #000000,
    2px 0 0 #000000,
    0 2px 0 #000000,
    0 -2px 0 #000000;
    padding: 1px 8px;
/*    opacity: 0.75; */
}

/*img {
    opacity: 0.75;
} */

a {
    text-decoration: none;
}

h1 {
    font-size:3em; 
    text-align:center;
}

h2 {
    font-size:1.75em;
    text-align:center;
}