body {
    margin: 10px auto;
    padding: 0;
    color: #999999;
    background-color: #444444;
    font-family: tahoma,arial,helvetica,verdana,sans-serif;
  }

#wrapper {
  background-color: #000000;
  margin: 0 auto;
  width: 90%;
  border-radius: 15px;
  padding: 20px;
}
/* oben*/
header {
  margin: 0;
}

div#top {
  margin: 10px;
  padding: 15px;
  background-color: #000000;
  color: #FFFFFF;
  float: right;
  width: 20%;
}

.toptext {
  margin: 10px;
  padding: 10px 0px 0px 10px;
  font-size: 2.5em;
  font-family: "Trebuchet MS",tahoma,arial,helvetica,verdana,sans-serif;
  font-weight: bold;
  color: #006496;
}

.toptextklein {
 margin: 0px 0px 0px 10px;
  padding: 0px 0px 0px 30px;
  font-size: 1em;
  font-family: "Trebuchet MS",tahoma,arial,helvetica,verdana,sans-serif;
  font-weight: normal;
  color: #999999;
  font-style: italic;
}

div#navihor {
  background-color: #006496;
  margin: 20px 0;
  padding: 10px 20px 10px 0px;
  height: 30px;
  border-radius: 5px;
  background-image: linear-gradient(#006496 0%, #003D5B 100%);
  background-image: -webkit-linear-gradient(#006496 0%, #003D5B 100%);
}

.hornavi a:link, .hornavi a:active, .hornavi a:visited {
  color: #FFFFFF;
  background-color: transparent;
  text-decoration: none;
  font-family: tahoma,arial,helvetica,verdana,sans-serif;
  font-size: 1em;
  padding: 5px 20px;
  margin: 5px;
  text-align: left;
  line-height: 30px;
  font-weight: normal;
}

.hornavi a:hover, hornavi a:focus {
  color: #FFFFFF;
  background-color: #00AAFF;
  text-decoration: none;
  font-family: tahoma,arial,helvetica,verdana,sans-serif;
  border-radius: 5px;
}

/* Navigation links*/
nav {
  width: 20%;
  float: left;
  padding: 2px;
  margin: 0;
}

nav h2 {
  color: #ffffff;
  background-color: #505050;
  font-size: 1.063em;
  font-weight: bold;
  margin: 0px 0px 10px 0px;
  padding: 5px;
  font-family: "Trebuchet MS",calibri,georgia,serif;
  letter-spacing: 1px;
  line-height: 20px;
  border-radius: 5px;
  border: 1px solid #3A3A3A;
  background-image: linear-gradient(#505050 0%, #181818 100%);
  background-image: -webkit-linear-gradient(#505050 0%, #181818 100%);
}

nav ul {
  list-style-type:none;
  padding: 0;
  margin: 0;
  border: 1px dashed #808080;
  border-radius: 5px;
}

nav li {
  list-style: none;
  margin: 0;
  padding: 0;
}

nav ul a:link,
nav ul a:visited,
nav ul a:active {
  color: #006496;
  background-color: transparent;
  padding: 3px 3px 3px 8px;
  margin: 0;
  text-decoration: none;
  font-family: tahoma,arial,helvetica,verdana,sans-serif;
  display: block;
  font-weight: normal;
  font-size: 0.875em;
  line-height: 25px;
}

nav ul a:hover,
nav ul a:focus {
  font-weight: bold;
  text-decoration: none;
  font-family: tahoma,arial,helvetica,verdana,sans-serif;
  color: #FFFFFF;
  font-weight: normal;
  background-color: #006496;
}
/*     submenu navigation links      */

 


aside {
  width: 20%;
  float: right;
}

aside h2 {
  color: #ffffff;
  background-color: #444444;
  font-size: 1.063em;
  font-weight: bold;
  margin: 0px 0px 10px 0px;
  padding: 5px;
  font-family: "Trebuchet MS",calibri,georgia,serif;
  letter-spacing: 1px;
  line-height: 20px;
  border-radius: 5px;
  border: 1px solid #3A3A3A;
  background-image: linear-gradient(#505050 0%, #181818 100%);
  background-image: -webkit-linear-gradient(#505050 0%, #181818 100%);
}

aside p {
  padding: 5px;
  margin: 0;
}

.textboxrighttext {
  text-align: justify;
  font-size: 0.750em;
  font-style: italic;
  border: 1px dashed #808080;
  border-radius: 5px;
  margin-bottom: 10px;
}
aside_2 {
  width: 20%;
  float: right;
}
aside_2 h2 {
  color: #ffffff;
  background-color: #444444;
  font-size: 1.063em;
  font-weight: bold;
  margin: 0px 0px 10px 0px;
  padding: 5px;
  font-family: "Trebuchet MS",calibri,georgia,serif;
  letter-spacing: 1px;
  line-height: 20px;
  border-radius: 5px;
  border: 1px solid #3A3A3A;
  background-image: linear-gradient(#505050 0%, #181818 100%);
  background-image: -webkit-linear-gradient(#505050 0%, #181818 100%);
}
aside_2 p {
  padding: 5px;
  margin: 0;
}

/* Hauptteil*/
main {
  display: block;  /*wegen Fehldarstellung IE*/
}

/* Inhalt*/
article {
  margin-left: 21%;
  margin-right: 21%;
  margin-top: 0;
  padding: 0 10px;
  font-size: 0.813em;
  font-weight: normal;
  text-align: left;
  line-height: 22px;
}

article h1 {
  font-size: 2em;
  margin: 0;
  color: #FFFFFF;
  font-family: "Trebuchet MS",georgia,calibri,serif;
  letter-spacing: 1px;
}

article h2 {
  color: #808080;
  background-color: inherit;
  font-family: "Trebuchet MS",georgia,calibri,serif;
  font-size: 1.5em;
  text-align: left;
  margin: 3px;
  padding: 2px;
}

article h3 {
  color: #006496;
  background-color: inherit;
  font-family: "Trebuchet MS",georgia,calibri,serif;
  font-size: 1.5em;
  font-style: italic;
  padding-left: 5px;
  font-weight: normal;
}

article h4 {
  color: #FFFFFF;
  background-color: #006496;
  font-size: 1.250em;
  font-weight: bold;
  margin: 0px;
  padding: 2px;
  font-family: "Trebuchet MS",georgia,calibri,serif;
  letter-spacing: 1px;
  text-align: center;
}

article h5 {
  color: #666666;
  background-color: inherit;
  font-family: "Trebuchet MS",georgia,calibri,serif;
  font-size: 1.125em;
  font-weight: bold;
  margin: 2px;
  padding: 0;
}

article p {
  margin: 8px 2px;
}

footer {
  background-color: #006496;
  color: #FFFFFF;
  margin: 0;
  padding: 10px 0;
  height: 30px;
  text-align: center;
  border-radius: 5px;
  font-size: 0.836em;
  line-height: 30px;
  background-image: linear-gradient(#006496 0%, #003D5B 100%);
  background-image: -webkit-linear-gradient(#006496 0%, #003D5B 100%);
}

/* allgemeine Angaben*/
a:link, a:visited, a:active {
  color: #006496;
  background-color: transparent;
  text-decoration: none;
  font-weight: bold;
  padding: 0;
  margin: 0;
}

a:hover {
  color: #000000;
  background-color: #006496;
  text-decoration: underline;
}

img {
  border: 0;
  max-width: 100%;
  height: auto;
  display: block;
}

.clear {
 clear: both;
 margin: 0;
 padding: 0;
 line-height: 1px;
}

.copyright {
  font-size: 0.625em;
  text-align: center;
  font-weight: normal;
}

/******************Besonderheiten für Bildschirmgroesse max. 768px**********************/

@media (max-width: 768px) {

header {
  font-size: 0.7em;
}

div#top {
  margin-bottom: 0;
  padding: 0;
}

.toptext {
  margin: 0 0 0 10px;
  padding: 0;
}

.toptextklein {
  padding: 0;
}

div#navihor {
  height: 100%;
  padding: 10px 0px;
  font-size: 1.25em;
}

.hornavi a:link, .hornavi a:active, .hornavi a:visited {
  display: block;
  text-align: center;
}

.hornavi a:hover, hornavi a:focus {
  display: block;
}

nav{
  float: none;
  width: 100%;
  text-align: center;
  margin-bottom: 10px;
  padding: 0;
}

main {
  text-align: center;
}

aside {
  width: 100%;
  float: none;
}

article {
  margin: 0;
  padding: 10px 0;
  font-size: 10pt;
  font-weight: normal;
  text-align: left;
  line-height: 20px;
}

footer {
  margin: 0;
  padding: 10px 0;

}

}

/*****************Besonderheiten für Bildschirmgroesse max. 480px***********************/

@media (max-width: 480px) {

#wrapper {
  width: 85%;
}

}

<style>
		video.responsive-video {
		max-width: 300px;
		height: auto;
		}
		@media screen and (min-width: 768px)  {
		video.responsive-video {
		max-width: 640px;
		}
		}
		</style>