body {
  background-color: black;
  color: green;
}

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

li {
  float: left; 
}

.dropdown {
  overflow: hidden; 
}

.dropdown-button {
  margin-right: 10px; 
  cursor: pointer;
}

.dropdown-content {
  display: none; 
  position: absolute; 
  background-color: black;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

/* replaced by script and .show
.dropdown:hover .dropdown-content {
  display: block;
}
*/

.show {
  display: block;   
}

.dropdown-content a {
  color: white;
  text-decoration: none;
  display: block;
  text-align: left;
  cursor: pointer;
}
.dropdown-content a:hover {
  background-color: gray;
}