html,
body {
    background-color: lightgreen;
    display: block;
  padding: 5px;
  margin-left: auto;
  margin-right: auto;
  width: 100;
  background-repeat: no-repeat;
  background-size: cover;
    
}
.dropdown {
    position: relative;
    display: inline-block;
  }
  
  .dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px black;
    padding: 12px 16px;
    z-index: 1;
  }
  
  .dropdown:hover .dropdown-content {
    display: block;
  }