docs.css

body {
  max-width: 19cm;
  margin: 0 auto;
  padding: 0px 4px 0px 4px;
  font-family: Verdana, sans-serif;
}

img.resize {
  max-width: 19cm;
}

.navbar {
  overflow: hidden;
  background-color: #333;
}
.navbar a {
  float: left;
  font-size: 16px;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}
.dropdown {
  float: left;
  overflow: hidden;
}
.dropdown .dropbtn {
  font-size: 16px;  
  border: none;
  outline: none;
  color: white;
  padding: 14px 16px;
  background-color: inherit;
  font-family: inherit;
  margin: 0;
}
.navbar a:hover, .dropdown:hover .dropbtn {
  background-color: red;
}
.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}
.dropdown-content a {
  float: none;
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}
.dropdown-content a:hover {
  background-color: #ddd;
}
.dropdown:hover .dropdown-content {
  display: block;
}

#topbutton {
  display: none;
  position: fixed;
  bottom: 10px;
  right: 10px;
  z-index: 99;
  font-size: 16px;
  border: none;
  outline: none;
  background-color: red;
  color: white;
  cursor: pointer;
  padding: 12px;
  border-radius: 4px;
}
#topbutton:hover {
  background-color: #555;
}