.nav-btn, .dropdown, .nav-btn-dropdown
{
    text-decoration: none;
    user-select: none;
    display: inline;
    margin: 0px 25px;
    height: 52px;
    outline: 1px solid black;
    padding: 5px 14px;
    text-align: center;
    vertical-align: middle;
    line-height: 52px;
    font-size: 21px;
    color: black;
    background-color: #ffc904;
}

.nav-btn-dropdown
{
    display: block;
    margin: 5px 0;
}   

.dropdown-content
{
    padding: 5px 0;
    display: none;
    position: relative;
    top: 0px;
    box-sizing: border-box;
    color: black;
    z-index: 1;
}


.nav-btn:hover, .dropdown:hover, .nav-btn-dropdown:hover
{
    color: white;
    background-color: black;
    outline-color: white;
    transition: 0.5s;
}

.nav-btn:not(:hover), .dropdown:not(:hover), .nav-btn-dropdown:not(:hover)
{
    transition: 0.7s;
}

.dropdown:hover .dropdown-content 
{
    transition: 5s;
    display: block;
}