.header {
  background-color: #460076;
  padding: 20px;
  text-align: center;
  color: white;
}

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  position: sticky;
  overflow: hidden;
  top:0;
  background-color: #7f00d4;
}

.klein {
  #float: left;
  #font-size: 11px;
  font: 75% Arial, sans-serif;
}

li {
  float: left;
}

li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li a:hover {
  background-color: #6300a5;
}

h1{
  text-align: center;
}

body{
  font-family: Helvetica, Arial, sans-serif;
  font-size: 100%;
  #background-color: #d287ff;
}

.Text{ font-size: 140%; text-align: left;}

/* von https://www.w3schools.com/css/css_table.asp  */
#symptome {
  font-family: Helvetica, Arial, sans-serif;
  font-size: 100%;
  border-collapse: collapse;
  width: 80%;
}

#symptome td, th {
  border: 1px solid #ddd;
  padding: 8px;
}

#symptome tr:nth-child(even){background-color: #f2f2f2;}

#symptome tr:hover {background-color: #ddd;}

#symptome th {
  padding-top: 12px;
  padding-bottom: 12px;
  text-align: left;
  background-color: #7f00d4;
  color: white;
}