CSS – Getting rid of transparent box - html

Question

After creating a navigation bar, I discovered a transparent box around it, which has some transparent features. Though it's not strikingly noticeable, I would still like to remove it. I've attached an image and the CSS code. I think the .menu tag is creating the transparent box, but I don't know how to remove it.
/* Navigation */
.clearfix {
width: 595px;
}
.clearfix:after {
display: block;
clear: both;
}
.menu-wrap {
width: 80px;
box-shadow: 0px 1px 3px rgba(0,0,0,0.2);
position: absolute;
top: 5.5%;
left: 55%;
}
.menu {
width: 100%;
margin: 0px;
right: 10px;
}
.menu li {
margin: 0px;
list-style: none;
font-family: "Source Sans Pro", Helvetica, Arial, sans-serif;
}
.menu a {
transition: all linear 0.15s;
color: #ffffff;
}
.menu li:hover > a, .menu .current-item > a {
text-decoration: none;
color: #000000;
}
.menu .arrow {
font-size: 11px;
line-height: 0%;
}
/* Top Level */
.menu > ul > li {
float: left;
display: inline-block;
position: relative;
font-size: 1em;
}
.menu > ul > li > a {
padding: 10px 30px;
display: inline-block;
text-decoration: none;
}
.menu > ul > li:hover > a, .menu > ul > .current-item > a {
background: #ffffff;
}
/* Bottom Level */
.sub-menu {
width: 140%;
padding: 5px 0px;
position: absolute;
top: 100%;
left: 0px;
z-index: -1;
opacity: 0;
transition: opacity linear 0.15s;
box-shadow: 0px 2px 3px rgba(0,0,0,0.2);
background: #ffffff;
}
.menu li:hover .sub-menu {
z-index: 1;
opacity: 1;
}
.sub-menu li {
display: block;
font-size: 1em;
}
.sub-menu li a {
padding: 10px 30px;
display: block;
color: #000000;
}
.sub-menu li a:hover, .sub-menu .current-item a {
background: #e0e0e0;
}

Answer 1

I played around with it a little and figured it out, but anyone else can feel free to comment if my answer isn't satisfactory.
The problem was actually caused by the .menu-wrap tag, and all I had to do to remove it was remove the box-shadow: 0px 1px 3px rgba(0,0,0,0.2); attribute I added to the code. It seems this transparent box had problems with the box-shadow property.