Drop Down Menu is Overlapping my Nav Bar - html

Question

I'm building a site for a client and I'm having trouble getting the drop down menu to appear clear below the navbar - instead it is overlapping the navbar, and if I increase the top margin of the drop down menu to push it below the navbar there is a gap between the drop down and the parent list item where the hover property to make it appear does not take affect.
I've created a fiddle of the navbar here - http://jsfiddle.net/s4dpby4v/1/
And you can view the live version here - http://japesfawcett.com/ps/index.html
HTML:
<div class="header">
<div class="logo">
<h1>PAM SHAW INTERIORS</h1>
</div>
<nav>
<ul>
<li>ABOUT</li>
<li class="has-drop">
WORK +
<ul class="drop-down">
<li style="padding-bottom: 0;">COMMERCIAL</li>
<li style="padding-right: 80px; padding-bottom: 0;">RESIDENTIAL</li>
</ul>
</li>
<li>CONTACT</li>
</ul>
</nav>
</div>
CSS:
.header {
width: 100%;
background-color: #fff;
margin: 0 auto;
height: 75px;
z-index: 9999;
}
.logo h1 {
float: left;
font-size: 20px;
letter-spacing: 4px;
width: 25%;
padding-top: 10px;
margin-top: 18px;
margin-left: 75px;
font-weight: 300;
}
.logo a {
text-decoration: none;
color: #000;
}
nav {
font-family: 'Lato', sans-serif;
width: 60%;
font-size: 14px;
font-weight: 300;
text-align: right;
letter-spacing: 4px;
float: right;
margin-top: 19px;
margin-right: 75px;
}
nav ul {
float: right;
list-style: none;
padding-top: -5px;
}
nav li {
padding-left: 15px;
padding-right: 10px;
padding-bottom: 15px;
display: inline-block;
}
nav ul li ul.drop-down {
width: 100%;
background: #fff;
display: none;
position: absolute;
z-index: 999;
padding: 5px 0 5px 0;
margin: 15px 0 0 0;
left: 0;
line-height: 2.5;
clear: both;
border-top: 1px solid #F1F1F1;
}
nav li:hover ul.drop-down {
display: block;
}
nav ul li ul.dropdown li {
display: block;
padding: 0;
margin: 0;
}
nav li a {
text-decoration: none;
color: #000;
display: inline-block;
}
nav li a:hover {
text-decoration: none;
color: #CCC;
-webkit-transition: all 800ms ease;
-moz-transition: all 800ms ease;
-ms-transition: all 800ms ease;
-o-transition: all 800ms ease;
transition: all 800ms ease;
}
Any guidance or help would be greatly appreciated!

Answer 1

.has-drop {position: relative;}
nav ul li ul.drop-down {width: auto;}
nav li li {width: 100%; text-align: center; box-sizing: border-box;}
Will clean up you drop down, you just need to remove the inline styles that you have on here to fix up the list styles.:
<li style="padding-bottom: 0;">COMMERCIAL</li>
<li style="padding-right: 80px; padding-bottom: 0;">RESIDENTIAL</li>
Here is my fiddle: http://jsfiddle.net/s4dpby4v/6/

Answer 2

You can check with this css
.has-drop {
padding-bottom: 30px;
}
nav ul li ul.drop-down
{
margin: 27px 0 0;
}