Creating a dropdown menu in an existing navigation bar - html

Question

I'm currently working on my website and I have an existing navigation bar. The problem is that I have too much information to share on one page. That's why I'd like to implement a dropdown menu in the existing navigation bar. I've tried many many things but it all seems to screw up my lay-out of the css or it completely deletes the navigation bar.
I got an exisiting code for a dropdown menu but I simply am not able to blend it with the existing css code. I got this code from the internet, it is not my property.
My HTML:
<div id="menu">
<ul>
<li class="current_page_item">Home</li>
<li>Onze service</li>
<li>Ons team</li>
<li>Prijzen</li>
<li>Contact</li>
</ul>
</div>
My CSS:
#menu
{
position: absolute;
right: 0;
top: 1em;
}
#menu ul
{
display: inline-block;
}
#menu li
{
display: block;
float: left;
text-align: center;
line-height: 60px;
}
#menu li a, #menu li span
{
display: inline-block;
margin-left: 1px;
padding: 0em 1.5em;
letter-spacing: 0.10em;
text-decoration: none;
font-size: 1.0em;
text-transform: uppercase;
outline: 0;
color: #212121;
background: #ECECEC;
}
#menu li:hover a, #menu li.active a, #menu li.active span
{
}
#menu .current_page_item a
{
background: #E24E2A;
color: #FFF;
}
#menu .icon
{
}
Drop down menu:
#primary_nav_wrap
{
margin-top:15px
}
#primary_nav_wrap ul
{
list-style:none;
position:relative;
float:left;
margin:0;
padding:0
}
#primary_nav_wrap ul a
{
display:block;
color:#333;
text-decoration:none;
font-weight:700;
font-size:12px;
line-height:32px;
padding:0 15px;
font-family:"HelveticaNeue","Helvetica Neue",Helvetica,Arial,sans-serif
}
#primary_nav_wrap ul li
{
position:relative;
float:left;
margin:0;
padding:0
}
#primary_nav_wrap ul li.current-menu-item
{
background:#ddd
}
#primary_nav_wrap ul li:hover
{
background:#f6f6f6
}
#primary_nav_wrap ul ul
{
display:none;
position:absolute;
top:100%;
left:0;
background:#fff;
padding:0
}
#primary_nav_wrap ul ul li
{
float:none;
width:200px
}
#primary_nav_wrap ul ul a
{
line-height:120%;
padding:10px 15px
}
#primary_nav_wrap ul ul ul
{
top:0;
left:100%
}
#primary_nav_wrap ul li:hover > ul
{
display:block
}
Thanks in advance!

Answer 1

Your navigation wrapper is menu whereas in the CSS from online it is primary_nav_wrap, so swap instances of these to menu.
In the html itself nested unordered list elements is used for the drop-downs, so add these under the list element where you need a drop-down.
Html:
<div id="menu">
<ul>
<li class="current_page_item">Home<ul>
<li>sub1</li>
<li>sub2</li>
<li>sub3</li>
</ul>
<li>Onze service</li>
<li>Ons team</li>
<li>Prijzen</li>
<li>Contact</li>
</ul>
</div>
CSS:
#menu ul {
display:inline-block;
list-style:none;
position:relative;
float:left;
margin:0;
padding:0
}
#menu li {
display:block;
float:left;
text-align:center;
line-height:60px
}
#menu li a,#menu li span {
display:inline-block;
margin-left:1px;
padding:0 1.5em;
letter-spacing:.1em;
text-decoration:none;
font-size:1em;
text-transform:uppercase;
outline:0;
color:#212121;
background:#ECECEC
}
#menu .current_page_item a {
background:#E24E2A;
color:#FFF
}
#menu {
margin-top:15px
}
#menu ul a {
display:block;
color:#333;
text-decoration:none;
font-weight:700;
font-size:12px;
line-height:32px;
padding:0 15px;
font-family:"HelveticaNeue","Helvetica Neue",Helvetica,Arial,sans-serif
}
#menu ul li {
position:relative;
float:left;
margin:0;
padding:0
}
#menu ul li.current-menu-item {
background:#ddd
}
#menu ul li:hover {
background:#f6f6f6
}
#menu ul ul {
display:none;
position:absolute;
top:100%;
left:0;
background:#fff;
padding:0
}
#menu ul ul li {
float:none;
width:200px
}
#menu ul ul a {
line-height:120%;
padding:10px 15px
}
#menu ul ul ul {
top:0;
left:100%
}
#menu ul li:hover > ul {
display:block
}
Here is a jsfiddle of the code merged:
https://jsfiddle.net/o51pp5s6/