styles.css

table, th, td {
  border: 1px solid black;
}

/* Dropdown Button */
.dropbtn {
  background: linear-gradient(to bottom, #f0f0f1 0%, #a9a9a9 100%);
  color:  #808080;
  padding: 16px;
  font-size: 16px;
  font-weight: bold;
  border: none;
  text-shadow: 1px 1px 0px #000;
  color: #F0F0F0;
}

/* The container <div> - needed to position the dropdown content */
.dropdown {
  position: relative;
  display: inline-block;
}

/* Dropdown Content (Hidden by Default) */
.dropdown-content {
  display: none;
  position: absolute;
  background: url(wood.jpg) no-repeat center fixed;
  background-size: cover;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

/* Options inside the dropdown */
.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  font-family: Charcoal, sans-serif;
  display: block;
}

/* Change color of dropdown options on hover */
.dropdown-content a:hover {  background: url(hoverwood.jpg) no-repeat center fixed;
  background-size: cover;}

/* 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;}