Custom CSS spoils Lightbox functions

Hi, for some time I was searching for a reason why my lighbox does not work (with any plugin) and now I know that it was my custom CSS that broke the lightbox effect. The question is – which part of my CSS causes the problem.

/*
Welcome to Custom CSS!

CSS (Cascading Style Sheets) is a kind of code that tells the browser how
to render a web page. You may delete these comments and get started with
your customizations.

By default, your stylesheet will be loaded after the theme stylesheets,
which means that your rules can take precedence and override the theme CSS
rules. Just write here what you want to change, you don't need to copy all
your theme's stylesheet content.
*/

.post-meta .meta_categories {
	background: url("http://jackgraal.com/wp-content/uploads/2013/04/category-icon.png");
}

#copyright h3 {
	display: none;
}

#copyright p {
	width: 960px;
}

#footer-menu {
	display: none;
}

#footer {
	background: transparent !important;
	padding-top: 20px;
	border: none;
}

.sidebar {
	position: relative;
	top: -23px;
}

#content {
	top: -10px;
	position: relative;
}

.sidebar div {
	margin-left: -11px;
	margin-right: -11px;
	margin-top: -4px;
	margin-bottom: -14px;
}

#disqus_thread {
	background-color: #ededed !important;
	margin: 0;
	padding: 10px;
}

#container {
	box-shadow: none;
}

#top-bar,.top-bar-preview .top-bar {
	background: none;
}

#top-bar,.top-bar-preview .top-bar {
	border: none;
}

#header, .header-preview .header {
	border: none;
}

#header-menu-wrap {
	background: #000000;
	background: -moz-linear-gradient(#000000,#000000);
	background: -webkit-linear-gradient(#000000,#000000);
	background: -o-linear-gradient(#000000,#000000);
	-ms-filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#000000',EndColorStr='#000000');
	background: linear-gradient(#000000,#000000);
}

#header-menu > li > a {
	color: #ffffff;
}

#header-menu > li:hover,#header-menu > li.current-menu-item,#header-menu > li.current-menu-ancestor {
	background: #e6e6e6;
	background: -moz-linear-gradient(#eee,#e6e6e6);
	background: -webkit-linear-gradient(#eee,#e6e6e6);
	background: -o-linear-gradient(#eee,#e6e6e6);
	-ms-filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#eee',EndColorStr='#e6e6e6');
	background: linear-gradient(#eee,#e6e6e6);
}

#header-menu ul li, .primary-menu-preview.dropdown ul li {
	background: #e6e6e6;
	background: -moz-linear-gradient(#eee,#e6e6e6);
	background: -webkit-linear-gradient(#eee,#e6e6e6);
	background: -o-linear-gradient(#eee,#e6e6e6);
	-ms-filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#eee',EndColorStr='#e6e6e6');
	background: linear-gradient(#eee,#e6e6e6);
}

#header-menu ul li:hover,#header-menu ul li.current-menu-item,#header-menu ul li.current-menu-ancestor,.primary-menu-preview.dropdown ul li.current-menu-item,.primary-menu-preview.dropdown ul li.current-menu-ancestor {
	background: #333333;
	background: -moz-linear-gradient(#000000,#333333);
	background: -webkit-linear-gradient(#000000,#333333);
	background: -o-linear-gradient(#000000,#333333);
	-ms-filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#000000',EndColorStr='#333333');
	background: linear-gradient(#000000,#333333);
}

#nav #header-menu ul,.primary-menu-preview .sub-menu {
	box-shadow: 0 1px 2px #000000;
}

#secondary-menu-wrap {
	background: #333333;
}

#secondary-menu-wrap {
	border-color: #333333;
}

#secondary-menu ul li:hover,#secondary-menu .sub-menu li.current-menu-item,#secondary-menu ul li.current-menu-ancestor,.secondary-menu-preview .sub-menu li.current-menu-item,.secondary-menu-preview .sub-menu li.current-menu-ancestor {
	background: #333333;
	background: -moz-linear-gradient(#333,#333333);
	background: -webkit-linear-gradient(#333,#333333);
	background: -o-linear-gradient(#333,#333333);
	-ms-filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#333',EndColorStr='#333333');
	background: linear-gradient(#333,#333333);
}

#nav #secondary-menu ul,.secondary-menu-preview .sub-menu {
	box-shadow: 0 1px 2px #333333;
}

#content, .menu-bottom-shadow, #sidebar_bottom {
	background-color: rgba(0,0,0,0);
}

.post-title, .post-title a, .post-title a:visited, .entry-footer {
	border-color: #dbdbdb;
}

.sticky {
	background-color: #ffffff;
}

.child-page {
	background-color: #ffffff;
}

.sidebar div.sidebar-wrap {
	background-color: #ffffff;
	background: none;
}

.sidebar div.sidebar-wrap {
	-moz-box-shadow: 0 0 0 #ededed;
	-webkit-box-shadow: 0 0 0 #ededed;
	box-shadow: 0 0 0 #ededed;
}

.sidebar ul li {
	border-color: #d4d4d4;
}

.sidebar h3 {
	border-color: #000000;
}

.sidebar h3 {
	text-shadow: 0 -1px #000000;
}

.sidebar h3 {
	background: #000000;
	background: -moz-linear-gradient(#000000,#000000);
	background: -webkit-linear-gradient(#000000,#000000);
	background: -o-linear-gradient(#000000,#000000);
	-ms-filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#000000',EndColorStr='#000000');
	background: linear-gradient(#000000,#000000);
}

.featured_slider {
	background: none;
}

.block-button, .block-button:visited, .Button, .colour-preview .button, #commentform #submit, .wpsc_buy_button {
	background: #000000;
	background: -moz-linear-gradient(#000000,#000000);
	background: -webkit-linear-gradient(#000000,#000000);
	background: -o-linear-gradient(#000000,#000000);
	-ms-filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#000000',EndColorStr='#000000');
	background: linear-gradient(#000000,#000000);
	border-color: #000000;
	text-shadow: 0 -1px 1px #363636;
	color: #fff;
	-moz-box-shadow: 0 0 5px #fff;
	-webkit-box-shadow: 0 0 5px #fff;
	box-shadow: 0 0 5px #fff;
}

.block-button:hover, .colour-preview .button:hover, #commentform #submit:hover,.wpsc_buy_button:hover {
	background: #000000;
	background: -moz-linear-gradient(#000000,#000000);
	background: -webkit-linear-gradient(#000000,#000000);
	background: -o-linear-gradient(#000000,#000000);
	-ms-filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#000000',EndColorStr='#000000');
	background: linear-gradient(#000000,#000000);
	color: #fff;
}

.page-title {
	background: #ffffff;
	background: -moz-linear-gradient(left top,#ffffff,#ffffff);
	background: -webkit-linear-gradient(left top,#ffffff,#ffffff);
	background: -o-linear-gradient(left top,#ffffff,#ffffff);
	-ms-filter: progid:DXImageTransform.Microsoft.gradient(gradientType=1,startColorStr='#ffffff',EndColorStr='#ffffff');
	background: linear-gradient(left top,#ffffff,#ffffff);
}

.page-title {
	color: #575757;
}

.page-title span {
	color: #000000;
}

.page-title {
	text-shadow: 0 -1px 0 #ffffff;
}

#footer,.graphene-footer {
	background-color: #000000;
	color: #999;
}

#copyright h3,.graphene-copyright .heading {
	color: #999;
}

.header_title, .header_title a, .header_title a:visited, .header_title a:hover, .header_desc {
	color: #000000;
}

#header .header_title {
	font-family: 'Russo One';
}

.featured_slider #slider_root {
	height: 214px;
}

a,.post-title,.post-title a,#comments > h4.current a {
	color: #284f86;
}

a:visited,.post-title a:visited {
	color: #284f86;
}

a:hover,.post-title a:hover {
	color: #9a2323;
}

.post-title, .post-title a, .post-title a:hover, .post-title a:visited {
	color: #000000;
}

Thanks to everyone who is willing to help.

my webiste http://jackgraal.com