An overview of turretcss and basic styling behaviours including global variables, fonts, color palettes, and media queries.



On top of Normalize.css, turretcss applies some basic resets to ensure the correct rendering of elements. These resets include border-box for global box-sizing, max-width 100% for images, and removing top and bottom margins for first-child and last-child typography, form, and block element items.

Box Sizing

For more straightforward sizing in CSS, turretcss switches the global box-sizing value from content-box to border-box. This ensures padding does not affect the final computed width of an element, but it can cause problems with some third party software like Google Maps and Google Custom Search Engine.

Text Rendering

To improve type rendering for legibility text-rendering: optimizeLegibility; is set on the root <html> element. This allows browsers to emphasize legibility over rendering speed and geometric precision. This enables kerning and optional ligatures. MDN

Font Smoothing

turretcss sets --font-smoothing-antialiased on the <html> root tag for browsers that support font-smoothing, this can be overwritten with the --font-smoothing-auto mixin.

Min Height

body {
  width: 100%;
  min-height: 100%;

Margin Resets

turretcss resets vertical margins for nested HTML typography and form elements. This aims to make container element (<div>, <section>, etc.) margins more predictable, this affects the first and last children of nested heading elements (h1, h2, h3, h4, h5, h6), typography elements (p, dl, dd, dt, ul li, ol li, blockquote, cite), and form elements (.field, fieldset, label, input, textarea, .select, and .control).

selectors {

  &:first-child {
    margin-top: 0;

  &:last-child {
    margin-bottom: 0;


Images in turretcss are made responsive-friendly via the addition of max-width: 100%; and height: auto; to images so that it scales nicely to the parent element.

<img src="..." alt="...">


Some top level definitions for general styles on the <body> tag.

--body-font-family: var(--font-family);
--body-font-weight: var(--font-weight);
--body-color: var(--color);
--body-line-height: var(--line-height);
--body-letter-spacing: var(--letter-spacing);
--body-background: var(--background);


Content wrapper with max-width set at differing sizes at various media query breakpoints.

By default the container has @gutter padding applied to the left and right of the container <div>, this is configurable for each breakpoint as needed.

--container-xl: 90rem;
--container-l: 80rem;
--container-m: 70rem;
--container-s: 100%;
--container-xs: 100%;
<div class="container">...</div>


The gutter is padding applied to the left and right of the container to ensure content does not touch the sides of the viewport.

--gutter: var(--space-xs);

Media Queries

@custom-media --xs (max-width: 767px);
@custom-media --s (min-width: 768px) and (max-width: 1023px);
@custom-media --s-up (min-width: 768px);
@custom-media --s-down (max-width: 1023px);
@custom-media --m (min-width: 1024px) and (max-width: 1279px);
@custom-media --m-up (min-width: 1024px);
@custom-media --m-down (max-width: 1279px);
@custom-media --l (min-width: 1280px) and (max-width: 1679px);
@custom-media --l-up (min-width: 1280px);
@custom-media --l-down (max-width: 1679px);
@custom-media --xl (min-width: 1680px);


By default turretcss’s print styles are formatted for A4 page size with a margin of 1.5cm 2cm. Print styles include making text @black, and removing backgrounds from elements by default. Links are displayed next to anchors using :after pseudo content.

--print-page-size: A4;
--print-page-margin: 1.5cm 2cm;