Reducing the menu background to cover just three columns.

I have the following code as part of my css file.
					#nav ul li div.drop_nav.destinations, #nav ul li div.drop_nav.destinations:hover {
						/*width: calc(418% + 12px);*/
						width: 387%;
						padding: 0 13px 21px;
						background-position: calc((((60% - 12px)/8) - 10px)) 0;
						left: 0;
						margin-left: 0;
                                        #nav ul li div.drop_nav.destinations ul li {width: 20%;}
					#nav ul li div.drop_nav ul li.nav1 { left: 0; padding: 0 10px; }
					#nav ul li div.drop_nav ul li.nav2 { left: 20%; padding: 0 10px; }
					#nav ul li div.drop_nav ul li.nav3 { left: 40%; padding: 0 10px; }#nav ul li div.drop_nav.destinations ul li ul li {
						padding: 2px 0;	
						width: 100%;
					#nav ul li div.drop_nav.destinations ul li ul li a {
						text-transform: none;
						font-weight: 400;
						border: none;
						margin-top: 0;
						/*background: url(../../images/res/bullet_white.png) left center no-repeat;*/
						padding: 0;
					#nav ul li div.drop_nav.destinations, #nav ul li div.drop_nav.destinations:hover  {
		width: calc(387% + 12px);
		background-position: calc((((100% - 12px)/8) - 50px)) 0;

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 I only want the menu to cover the three columns. See attached file for picture.  What should I change?
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Julian HansenCommented:
Try making the gray area inline-block instead of block.
mmathis32Author Commented:
That didn't work.
Julian HansenCommented:
Then without being able to see the source in action - can't really assist.

We have practically no source code, no styling and the only context is a screen shot.

Either you need to post your styling and source or (preferably) give us a link  to the page.
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mmathis32Author Commented:
The page is and I've attached the styling.
Julian HansenCommented:
That menu is being modified with JavaScript. The script changes this
<div class="drop_nav destinations">

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To this
<div class="drop_nav destinations" style="width: 1024px; min-height: 443px; left: 0px; background-position: 20px 0px;">

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Notice the hard coded width in the style.
Whatever you do is going to be superseded by that.
mmathis32Author Commented:
where are you finding this?
Julian HansenCommented:
On the page you provided the link to. If you hover over Islands - the gray submenu panel comes up. Do an inspect element on that takes you to what I posted above.

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mmathis32Author Commented:
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