.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    bottom: 50px;

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown:hover .dropdown-content {
    display: block;
    bottom: 100%;
}

.dropdown-content {
       bottom:100%;  <!-- <<<THIS WILL MAKE THE MENU OPEN UP INSTEAD OF OPENING DOWN -->

       display: none;
       position: absolute;
       background-color: #f9f9f9;
       min-width: 160px;
       box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
   }

.dropdown-content {
       bottom:100%;
       display: none;
       position: absolute;
       background-color: #f9f9f9;

       min-width: 100%;  <!-- <<<THIS WILL MAKE THE POP UP BLOCK AS WIDE AS THE BUTTON -->

       box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
   }