Hover effect in nav bar doesn't work as wished - html

Question

I created a hover effect for my navigation bar / the list inside it. On hover I want to create a "pressed button" effect by applying a box shadow. But the shadow only is casted in a small box. (check picture below)
I want the shadow to fill out the whole navbar around the hovered area.
I have no idea where to put my code and would be glad about any help :)
HTML CODE:
<nav>
<div class="nav-wrapper">
<ul>
<li>Home</li>
<li>Projekte</li>
</ul>
</div>
</nav>
CSS CODE:
html, body {
margin: 0;
padding: 0;
height: 100%;
background-color:white;
font-family: 'Open Sans', sans-serif;
}
.nav-wrapper {
margin: 0 auto;
margin-top: 50px;
width: 60%;
padding-top: 5px;
padding-bottom: 5px;
color:#787878;
box-shadow: 2px 2px 3px #BDBDBD;
border-radius: 5px;
background: #f9f9f9; /* Old browsers */
background: -moz-linear-gradient(top, #f9f9f9 0%, #ededed 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#f9f9f9), color-stop(100%,#ededed)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #f9f9f9 0%,#ededed 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #f9f9f9 0%,#ededed 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, #f9f9f9 0%,#ededed 100%); /* IE10+ */
background: linear-gradient(to bottom, #f9f9f9 0%,#ededed 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#f9f9f9', endColorstr='#ededed',GradientType=0 ); /* IE6-9 */
}
ul {
list-style: none;
}
li {
display: inline;
padding: 0 15px;
}
li:hover {
box-shadow: 2px 2px 3px #BDBDBD inset;
}
a {
text-decoration: none;
color:#787878;
}

Answer 1

Add this:
li:hover {
box-shadow: 2px 2px 3px #BDBDBD inset, 2px 2px 3px #BDBDBD;
}
Preview:
Or the bevelled effect here:
li:hover {
box-shadow: 2px 2px 3px #BDBDBD inset, -2px -2px 3px #BDBDBD inset;
}
Preview:
Fiddle: http://jsbin.com/wolotuxico/1/edit?html,css,output
Update from Comments
Remove padding for .nav-wrapper and give it to li
.nav-wrapper {
padding: 0;
}
li {
display: inline-block;
padding: 15px;
}
Preview:
Fiddle: http://jsbin.com/bowawodode/2/edit

Answer 2

Remove the padding from the navigation and add it to the li's. Remember the border is outside the padding and inside the margin.
Example:
https://jsfiddle.net/m98yedk6/1/
.nav-wrapper {
position: relative;
margin: 0 auto;
margin-top: 50px;
width: 60%;
color:#787878;
box-shadow: 2px 2px 3px #BDBDBD;
border-radius: 5px;
background: #f9f9f9; /* Old browsers */
background: -moz-linear-gradient(top, #f9f9f9 0%, #ededed 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#f9f9f9), color-stop(100%,#ededed)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #f9f9f9 0%,#ededed 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #f9f9f9 0%,#ededed 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, #f9f9f9 0%,#ededed 100%); /* IE10+ */
background: linear-gradient(to bottom, #f9f9f9 0%,#ededed 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#f9f9f9', endColorstr='#ededed',GradientType=0 ); /* IE6-9 */
}
li {
display: inline-block;
padding: 10px;
}