update instruction

bootstrap/docs/css.html

@@ -0,0 +1,20 @@
+---
+layout: default
+title: CSS
+slug: css
+lead: "Global CSS settings, fundamental HTML elements styled and enhanced with extensible classes, and an advanced grid system."
+---
+
+
+{% include css/overview.html %}
+{% include css/grid.html %}
+{% include css/type.html %}
+{% include css/code.html %}
+{% include css/tables.html %}
+{% include css/forms.html %}
+{% include css/buttons.html %}
+{% include css/images.html %}
+{% include css/helpers.html %}
+{% include css/responsive-utilities.html %}
+{% include css/less.html %}
+{% include css/sass.html %}