varia-library-website/library/static/css/dropdown.css

/* Dropdown Button */
/* for sorting on Year, Type, License
*/
.filter {
  display: none;
}

.activebtn {
	background-color: #62b264;
}

#leftmostbtn{
  margin-left: 1em;
}

.show {
  display: block;
}
.dropdown {
  position: relative;
  display: inline-block;
}

/* Dropdown Content (Hidden by Default) */
.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f1f1f1;
  min-width: 120px;
  border: 3px solid black;
  z-index: 1;
}

/* Links inside the dropdown */
.dropdown-content button {
  color: black;
  padding: 6px;
  border: none;
  min-width: inherit;
  text-align: left;
  text-decoration: none;
  display: block;
}
.dropbtn {
  margin-top: 1em;
}
/* Change color of dropdown links on hover */
.dropdown-content button:hover {background-color: #62b264;}


/* Show the dropdown menu on hover */
.dropdown:hover .dropdown-content {display: block;}

/* Change the background color of the dropdown button when the dropdown content is shown */
.dropdown:hover .dropbtn {background-color: #3e8e41;}

@media only screen and (min-device-width: 320px) and (max-device-width: 480px)  {
  .dropdown-content button {
      font-size: 0.7em;
  }
  .container > button {
      font-size: 0.7em;
  }
  .dropdown > button  {
      font-size: 0.7em;
  }
}