.has-menu {
  position: relative;
  display: inline-block;
}

.submenu {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 170px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  padding: 10px;
  z-index: 1;
  background-color: black;
}

.has-menu:hover .submenu {
  display: block;
}