ul {
  list-style-type: none;    /* no bullet/numbering */
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
}

li {
  float: left;              /* make li run horizontaally */
}

li a, .dropbtn {
  display: inline-block;    /* inline: horizontal, -bloack: has width/height control */
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;   /* do not put underline below link */
}

li a:hover, .dropdown:hover .dropbtn {
  background-color: violet; /* red;   /* change background-color when hover */
}

li.dropdown {
  display: inline-block;   /* horizontal wrt previous li */
}

.dropdown-content {
  display: none;           /* hide by default, unless hover dropdown */
  position: absolute;      /* positioned relative to parent (dropdown) */
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;              /* shown in front of other text
  								when not hidden (-1: behind) */
}

.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;   /* no underline below links */
  display: block;          /* padded so seen as block */
  text-align: left;
}

.dropdown-content a:hover {
  background-color: yellow;	/* #f1f1f1; */
}

.dropdown:hover .dropdown-content {
  display: block;         /* unhide (from none to block) */
}