@import url(https://fonts.googleapis.com/css?family=Roboto);

html, body {
   background-image: url("mbg.jpg");
  background-color: #000000;
   background-repeat: no-repeat;
   background-size: cover;
    position: fixed;
    right: 0;
    bottom: 0;
    min-width: 100%;
    min-height: 100%;
}

h1,h2,h3,h4,h5,h6,a,font {
  color: white;
  font-family: 'Roboto'
}
.center-screen {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  min-height: 90vh;
}

.links-oben{
    position: absolute;
    left:1px;
    top: 1px;
}
.rechts-oben{
     position: absolute;
     right:1px;
     top: 1px;
    max-width: 20%;
}
.rechts-unten{
     position: absolute;
     bottom:1px;
     right: 1px;
}
.links-unten{
     position: absolute;
     bottom:1px;
     left: 1px;
}

iframe{
    overflow: hidden;
}