CSS Dropdown-menu not displaying when <li>-element is hovered. - html

Question

I have a top navigation bar with 4 options, where I wish that while the fourth option is hovered, a dropdown-menu will display.
The navigation bar is an unordered list, and the dropdown-menu (which should be activated by the fourth option) is a div consisting of 3 links.
The list item that is supposed to display the dropdown-menu while hovered:
<li class="dropdownbutton">Contact</li>
With the help of this line of code:
.dropdownbutton:hover .dropdowncontent {
display:inline-block;
}
And this is the CSS for the dropdown-content:
.dropdowncontent {
display:none;
background-color:#333;
margin-left:272px;
width:90px;
text-align:center;
}
What am I missing?

Answer 1

This should be allright.
ul {
margin: 0;
padding: 0;
list-style: none;
background-color: #333;
}
ul li {
display: inline-block;
position: relative;
text-align: left;
background-color: #333;
}
ul li a {
display: block;
color: #f2f2f2;
text-align: center;
padding: 16px 15px;
text-decoration: none;
transition-duration: 0.3s;
-webkit-transition-duration: 0.3s;
font-size: 17px;
font-family: Arial;
}
ul li a:hover {
background-color: #555;
}
ul li ul.dropdown {
min-width: 100%;
display: none;
position: absolute;
z-index: 999;
left: 0;
width: 90px;
}
ul li:hover ul.dropdown {
display: block;
}
ul li ul.dropdown li {
display: block;
}
ul li ul.dropdown li a {
font-size: 14px;
padding: 10px 15px;
}
<ul>
<li>Home</li>
<li>About Us</li>
<li>Products</li>
<li>Contact
<ul class="dropdown">
<li>Option 1</li>
<li>Option 2</li>
<li>Option 3</li>
</ul>
</li>
</ul>