diff --git a/_basic.scss b/_basic.scss
index 62d38a8..f307c86 100644
--- a/_basic.scss
+++ b/_basic.scss
@@ -2,6 +2,7 @@
 // Use a file outside of hippie i.e. vendor/normalize.css
 // -----------------------------------------------------------------------------
 // @import "../../vendor/normalizecss/normalize.css";
+// @import "../../node_modules/normalize.css/normalize.css";
 
 
 
diff --git a/elements/_grouping.scss b/elements/_grouping.scss
index 42b3d3c..75edc9f 100644
--- a/elements/_grouping.scss
+++ b/elements/_grouping.scss
@@ -67,6 +67,13 @@ hr {
 	border-width: $width_border_basic 0 0;
 	border-style: solid;
 	border-color: $color_border_basic;
+
+	&.vertical {
+		display: inline;
+		height: $line_basic;
+		margin: 0 $space_double;
+		border-width: 0 $width_border_basic 0 0;
+	}
 }
 
 .hr_hidden {
@@ -286,38 +293,9 @@ div {}
 // Flex
 .flex {
 	display: flex;
-}
 
-.flex_wrap {
-	@extend .flex;
-	flex-wrap: wrap;
-}
-
-.flex_row {
-	@extend .flex;
-	flex-direction: column;
-	// align-items: flex-start;
-	justify-content: flex-start;
-}
-
-.flex_child {
-	flex: 0 1 auto;
-}
-
-.flex_child_one {
-	flex: 1;
-}
-
-.flex_child_end {
-	align-self: flex-end;
-}
-
-.flex_column_wrap {
-	@extend .flex_wrap;
-
-	.flex_column {
-		@extend .flex_child;
-		flex-grow: 1;
+	&.inline {
+		@extend %flex-inline;
 	}
 }
 
diff --git a/elements/_interactive.scss b/elements/_interactive.scss
index 95bf501..bf46005 100644
--- a/elements/_interactive.scss
+++ b/elements/_interactive.scss
@@ -57,7 +57,7 @@ label + input {
 }
 
 input, button, textarea, select {
-	margin: $margin_io;
+	margin: $margin_inline;
 
 	&[disabled="disabled"],
 	&[disabled] {
@@ -79,6 +79,10 @@ td > textarea {
 	}
 }
 
+.input_io, .button_io, .io_textarea, .io_select {
+	margin: $margin_io;
+}
+
 .input_io, .io_textarea, .io_select {
 	padding: $space_half;
 	color: $color_text_io;
diff --git a/elements/_sections.scss b/elements/_sections.scss
index 542a5dd..ea0790e 100644
--- a/elements/_sections.scss
+++ b/elements/_sections.scss
@@ -1,3 +1,5 @@
+@use "sass:map";
+
 // Root
 // -----------------------------------------------------------------------------
 html {
@@ -81,7 +83,16 @@ section {}
 
 // Navigation
 // -----------------------------------------------------------------------------
-nav {}
+nav {
+
+	ul {
+		margin: 0;
+
+		&.inline li {
+			display: inline-block;
+		}
+	}
+}
 
 // Aside element
 // -----------------------------------------------------------------------------
@@ -107,6 +118,33 @@ aside {
 	*:first-child {
 		margin-top: 0;
 	}
+
+	&.io {
+
+		input,
+		textarea,
+		select,
+		button {
+			display: block;
+			width: 100%;
+		}
+
+		input {
+			@extend .input_io;
+		}
+
+		textarea {
+			@extend .io_textarea;
+		}
+
+		select {
+			@extend .io_select;
+		}
+
+		button {
+			@extend .button_io;
+		}
+	}
 }
 
 // Headings
@@ -180,6 +218,101 @@ header {}
 	}
 }
 
+header,
+aside,
+footer {
+	&.io {
+		.span_solo {
+			border: $width_border_io solid transparent;
+			padding: $padding_basic;
+		}
+	}
+}
+
+header.io,
+aside.io {
+	padding: $space_basic;
+
+	input,
+	button,
+	textarea,
+	select {
+		margin-inline: $space_half;
+	}
+
+	input {
+		@extend .input_io;
+	}
+
+	textarea {
+		@extend .io_textarea;
+	}
+
+	select {
+		@extend .io_select;
+	}
+
+	button {
+		@extend .button_io;
+	}
+}
+
+header,
+footer {
+	&.io {
+		@extend %flex-inline;
+		align-items: stretch;
+	}
+}
+
+header.io {
+	z-index: map.get($z-indexes, "content-top");
+
+	&>*:last-child *:last-child {
+		margin-right: 0;
+	}
+
+	&>*:first-child *:first-child {
+		margin-left: 0;
+	}
+
+	nav,
+	ul {
+		@extend %flex-inline;
+		align-items: stretch;
+	}
+
+	nav li {
+		margin: 0;
+	}
+
+	nav:last-child {
+		margin-left: auto;
+	}
+
+	h1 {
+		margin: 0;
+	}
+}
+
 // Footer
 // -----------------------------------------------------------------------------
-footer {}
\ No newline at end of file
+footer {
+	&.io {
+		input {
+			@extend .input_io;
+		}
+
+		textarea {
+			@extend .io_textarea;
+		}
+
+		select {
+			@extend .io_select;
+		}
+
+		button {
+			@extend .button_io;
+		}
+	}
+}
\ No newline at end of file
diff --git a/global/_common.scss b/global/_common.scss
index fcb9e3a..5165cfa 100644
--- a/global/_common.scss
+++ b/global/_common.scss
@@ -21,15 +21,15 @@
 }
 
 .di_none {
-	display: none;
+	display: none !important;
 }
 
 .op_hide {
-	opacity: 0;
+	opacity: 0 !important;
 }
 
 .op_show {
-	opacity: 1;
+	opacity: 1 !important;
 }
 
 .space_even_auto {
@@ -173,6 +173,34 @@
 
 
 
+// Flex & grid
+// -----------------------------------------------------------------------------
+%flex-inline {
+	display: flex;
+	flex-direction: row;
+	flex-wrap: wrap;
+	align-items: flex-start;
+	justify-content: flex-start;
+	gap: $space_half $space_basic;
+}
+
+%flex-column,
+%flex-row {
+	display: flex;
+	flex-wrap: nowrap;
+	gap: $space_basic;
+}
+
+%flex-column {
+	flex-direction: column;
+}
+
+%flex-row {
+	flex-direction: row;
+}
+
+
+
 // Positioned elements
 // -----------------------------------------------------------------------------
 %viewport_fixed {
diff --git a/global/_config.scss b/global/_config.scss
index 17eab37..f028f2d 100644
--- a/global/_config.scss
+++ b/global/_config.scss
@@ -142,7 +142,8 @@ $space_large: $space_basic * 16;
 
 $margin_basic: $space_basic 0 !default;
 $margin_double: $space_double 0 !default;
-$margin_io: 0 $space_small 0 0 !default;
+$margin_inline: 0 $space_double 0 0 !default;
+$margin_io: 0 !default;
 
 $padding_basic: calc(#{$space_basic} - 3px) $space_basic !default;
 $padding_link: calc(#{$space_basic} - 1px) calc(#{$space_basic} * 2) !default;
diff --git a/modules/navigation/_nav_module.scss b/modules/navigation/_nav_module.scss
index 608fd63..5f854b5 100644
--- a/modules/navigation/_nav_module.scss
+++ b/modules/navigation/_nav_module.scss
@@ -99,12 +99,11 @@ nav {
 	margin: $space_basic 0;
 
 	ul {
-		@extend .flex;
+		display: flex;
 		margin: 0 $space_large;
 
 		li {
-			@extend .flex_child;
-			flex-grow: 1;
+			flex: auto;
 			margin: 0;
 			text-align: center;
 
diff --git a/modules/tables/_tables_module.scss b/modules/tables/_tables_module.scss
index de2523e..2746bec 100644
--- a/modules/tables/_tables_module.scss
+++ b/modules/tables/_tables_module.scss
@@ -11,13 +11,15 @@
 		}
 	}
 
-	th, td {
+	th,
+	td {
 		border: 0;
 	}
 
 	.cell_icon {
 		width: 48px;
 		text-align: center;
+
 		img {
 			vertical-align: text-top;
 		}
@@ -29,9 +31,11 @@
 
 		&:hover {
 			background-color: $foxtrot_color;
+
 			a:first-child {
 				display: none;
 			}
+
 			a:last-child {
 				display: block;
 				color: $color_highlight_basic;
@@ -47,7 +51,8 @@
 		}
 	}
 
-	th:last-child, .cell_date {
+	th:last-child,
+	.cell_date {
 		width: 16%;
 		text-align: center;
 	}
@@ -65,4 +70,4 @@
 			max-height: 44px;
 		}
 	}
-}
+}
\ No newline at end of file