@font-face {
    font-family: 'GrundschriftRegular';
        src: url('/otf/GrundschriftRegular.otf') format('opentype');
    font-weight: normal;
    font-style: normal;
    font-display: swap;
      }

.kreide {
font-family: GrundschriftRegular, Verdana, Helvetica, Arial, sans-serif;
font-size: 40px;
color:white;
text-decoration: none;
}

.tschrift_w {
font-family: GrundschriftRegular, Verdana, Helvetica, Arial, sans-serif;
font-size: 40px;
color:white;
text-decoration: none;
}

.tschrift_s {
font-family: GrundschriftRegular, Verdana, Helvetica, Arial, sans-serif;
font-size: 40px;
color:black;
text-decoration: none;
}

.tschrift_b {
font-family: GrundschriftRegular, Verdana, Helvetica, Arial, sans-serif;
font-size: 40px;
color:blue;
text-decoration: none;
}

.tschrift_r {
font-family: GrundschriftRegular, Verdana, Helvetica, Arial, sans-serif;
font-size: 40px;
color:red;
text-decoration: none;
}

.tschrift_g {
font-family: GrundschriftRegular, Verdana, Helvetica, Arial, sans-serif;
font-size: 40px;
color:green;
text-decoration: none;
}


td{
  font-family: GrundschriftRegular, Verdana, Helvetica, Arial, sans-serif;
  font-size: 30px;
}


input[type=submit] {
    width: 150px;
    height: 75px;
    background-color: Green;
    color: White;
    font-family: GrundschriftRegular, Verdana, sans-serif;
    font-size: 30px;
    box-shadow: 5px 5px lightgray;
    border-radius: 20px;
}

input[type=submit]:hover {
    background-color: DarkCyan;
}


.t30 {
    font-family: GrundschriftRegular, Verdana, sans-serif;
    font-size: 30px;
    width: 75px;
    height: 100px;
    background-color: LightBlue;
    text-align: center;
}

.t30 a {
    display: block;
}

.t29 {
    font-family: GrundschriftRegular, Verdana, sans-serif;
    font-size: 30px;
    line-height: 35px;
}


.t24 {
    font-family: GrundschriftRegular, Verdana, sans-serif;
    font-size: 24px;
}

.t20 {
    font-family: GrundschriftRegular, Verdana, sans-serif;
    font-size: 20px;
}

.t16 {
    font-family: GrundschriftRegular, Verdana, sans-serif;
    font-size: 16px;
}

.t16 {
    font-family: GrundschriftRegular, Verdana, sans-serif;
    font-size: 14px;
}

.dz {
    width: 75px;
    height: 100px;
    text-decoration: none;
}


@media screen and (min-width: 320px) and (max-width: 767px) and (orientation: portrait) {
  html {
    transform: rotate(-90deg);
    transform-origin: left top;
    width: 100vh;
    height: 100vw;
    overflow-x: hidden;
    position: absolute;
    top: 100%;
    left: 0;
  }
}

.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}

.rechnen {
  font-family: GrundschriftRegular, Verdana, sans-serif; 
  font-size:50;
}