feat: New variants

- Add flex inline placeholder
- Add hr vertical class

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 {
@@ -286,6 +293,10 @@ div {}
 // Flex
 .flex {
 	display: flex;
+
+	&.inline {
+		@extend %flex-inline;
+	}
 }
 
 .flex_wrap {