html {
        box-sizing: border-box;
}

*,
::before,
::after {
        box-sizing: inherit;
}
body {
  color: black; background-color: white;
  font-size: 100.01%;
  font-family: Helvetica,Arial,sans-serif;
  margin: 1; padding: 1em;
  }
h1 {
    font-size: 1.5em;
    margin: 0 0 0.7em; padding: 0.3em;
    text-align: center;
    background-color: #1998F4;
    border: 2px ridge silver;
  }
ul#Navigation {
    font-size: 0.83em;
    float: left; width: 15em;
    margin: 0 0 1.2em; padding: 0;
    background-color: #1998F4;
    border: 2px solid silver;
  }

ul#Navigation li {
    list-style: none;
    margin: 0.4em; padding: 0;
  }
ul#Navigation a {
    display:block;
    padding: 0.2em;
    text-decoration: none; font-weight: bold;
    border: 1px solid black;
    border-left-color: white; border-top-color: white;
    color: maroon; background-color: #73E5EA;
  }

  ul#Navigation a:hover {
    border-color: white;
    border-left-color: black; border-top-color: black;
    color: white; background-color: gray;
  }

div#Inhalt {
  display: block;
  margin-center: 12em;
  padding: 0 1em;
  border: 5;

}
div#Inhalt h1 {
  font-size: 1.5em;
  margin: 0 0 2em;
}
div#Inhalt h2 {
  font-size: 1.2em;
  margin: 0 0 2em;
}
div#Inhalt p {
  font-size:1em;
  margin: 2em 0;
}
p#Fusszeile {
    clear: both;
    font-size: 0.9em;
    margin: 1; padding: 0.1em;
    text-align: center;
    background-color: #1998F4; border: 2px solid silver;
  }