demo_page/assets/sass/layout/_main.scss

///
/// Dimension by HTML5 UP
/// html5up.net | @ajlkn
/// Free for personal and commercial use under the CCA 3.0 license (html5up.net/license)
///

/* Main */

	#main {
		@include vendor('flex-grow', '1');
		@include vendor('flex-shrink', '1');
		@include vendor('display', 'flex');
		@include vendor('align-items', 'center');
		@include vendor('justify-content', 'center');
		@include vendor('flex-direction', 'column');
		position: relative;
		max-width: 100%;
		z-index: 3;

		article {
			@include vendor('transform', 'translateY(0.25rem)');
			@include vendor('transition', (
				'opacity #{_duration(article)} ease-in-out',
				'transform #{_duration(article)} ease-in-out'
			));
			@include padding(2.5rem, 2.5rem, (2rem, 0, 1rem, 0));
			position: relative;
			width: 40rem;
			max-width: 100%;
			background-color: transparentize(_palette(bg), 0.15);
			border-radius: _size(border-radius);
			opacity: 0;

			&.active {
				@include vendor('transform', 'translateY(0)');
				opacity: 1;
			}

			.close {
				display: block;
				position: absolute;
				top: 0;
				right: 0;
				width: 4rem;
				height: 4rem;
				cursor: pointer;
				text-indent: 4rem;
				overflow: hidden;
				white-space: nowrap;

				&:before {
					@include vendor('transition', 'background-color #{_duration(transition)} ease-in-out');
					content: '';
					display: block;
					position: absolute;
					top: 0.75rem;
					left: 0.75rem;
					width: 2.5rem;
					height: 2.5rem;
					border-radius: 100%;
					background-position: center;
					background-image: svg-url('<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="20px" height="20px" viewBox="0 0 20 20" zoomAndPan="disable"><style>line { stroke: #{_palette(border)}; stroke-width: 1; }</style><line x1="2" y1="2" x2="18" y2="18" /><line x1="18" y1="2" x2="2" y2="18" /></svg>');
					background-size: 20px 20px;
					background-repeat: no-repeat;
				}

				&:hover {
					&:before {
						background-color: _palette(border-bg);
					}
				}

				&:active {
					&:before {
						background-color: _palette(border-bg-alt);
					}
				}
			}
		}

		@include breakpoint('<=small') {
			article {
				@include padding(2rem, 2rem, (1.5rem, 0, 0.5rem, 0));

				.close {
					&:before {
						top: 0.875rem;
						left: 0.875rem;
						width: 2.25rem;
						height: 2.25rem;
						background-size: 14px 14px;
					}
				}
			}
		}

		@include breakpoint('<=xsmall') {
			article {
				@include padding(2rem, 1.5rem, (1rem, 0, 0.5rem, 0));
			}
		}
	}