initial version 23

assets/sass/layout/_bg.scss

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+///
+/// Dimension by HTML5 UP
+/// html5up.net | @ajlkn
+/// Free for personal and commercial use under the CCA 3.0 license (html5up.net/license)
+///
+
+/* BG */
+
+	#bg {
+		@include vendor('transform', 'scale(1.0)');
+		-webkit-backface-visibility: hidden;
+		position: fixed;
+		top: 0;
+		left: 0;
+		width: 100%;
+		height: 100vh;
+		z-index: 1;
+
+		&:before, &:after {
+			content: '';
+			display: block;
+			position: absolute;
+			top: 0;
+			left: 0;
+			width: 100%;
+			height: 100%;
+		}
+
+		&:before {
+			@include vendor('transition', 'background-color #{_duration(bg)} ease-in-out');
+			@include vendor('transition-delay', '#{_duration(intro)}');
+			background-image:		linear-gradient(to top, #{_palette(bg-overlay)}, #{_palette(bg-overlay)}),
+									url('../../images/overlay.png');
+			background-size:		auto,
+									256px 256px;
+			background-position:	center,
+									center;
+			background-repeat:		no-repeat,
+									repeat;
+			z-index: 2;
+		}
+
+		&:after {
+			@include vendor('transform', 'scale(1.125)');
+			@include vendor('transition', (
+				'transform #{_duration(article)} ease-in-out',
+				'filter #{_duration(article)} ease-in-out'
+			));
+			background-image:		url('../../images/bg.jpg');
+			background-position:	center;
+			background-size:		cover;
+			background-repeat:		no-repeat;
+			z-index: 1;
+		}
+
+		body.is-article-visible & {
+			&:after {
+				@include vendor('transform', 'scale(1.0825)');
+				@include vendor('filter', 'blur(0.2rem)');
+			}
+		}
+
+		body.is-preload & {
+			&:before {
+				background-color: _palette(bg-alt);
+			}
+		}
+	}