div#nav {
  width:25%;
  float:left;
  margin-left:6%;
  margin-right:1%;
  overflow:auto;
}
table#navtable th {
  background-color:rgb(146,148,116);
  border:1px solid rgb(146,148,116);
  text-align:center;
  color:white;
}
table th#preselector {
  height:50px;
  padding:0;
  font-size:15px;
  font-weight:normal;
  border:1px solid rgb(7,111,182);
}
table th#preselector:hover {
  border:1px solid #111;
}
table#navtable td {
  border-left:1px solid #aaa;
  border-right:1px solid #aaa;
}
a.priority {
  display:block;
  margin:0;
  padding:0;
  background-color:rgb(7,111,182);
  color:white;
  text-align:center;
  line-height:50px;
}
a.priority:hover{
  background-color:#111;
}
div#content{
  max-width:49%;
  float:left;
} 
table#contenttable th {
  background-color:rgb(146,148,116);
  text-align:center;
  color:white;
}
table#contenttable td {
  padding:0px;
}
a.contentlist {
  color:black;
}
a.contentlist:hover {
  color:red;
  text-decoration:underline;
}

@media screen and (max-width: 480px) {
    div#nav {
      width:96%;
      margin:50px 2% 0 2%;
    }
    div#content {
      width:96%;
      margin:0px 2% 0 2%;
    }
    table th#shipinguankan {
      background-color:#111;
    }
    iframe#video {
      width:384px;
      height:288px;
    }
}