Several other CSS unit types support layout adaptation. Our web page treats every … The :root psuedo-element has a higher specificity than the html element, therefore, it is preferable to set the CSS variables inside :root i.e. globally and above the html element—this is done for general hygiene over the cascade. topmargin The margin of the top of the body. Photo by Alexandru Acea on Unsplash. In general, anytime you can abstract the behavior of a component in one or more variables, you're making your life easier when that component needs editing (or you have to create a variation of the component). The following table enumerates a number of them: body { font-family: Verdana } table { font-family: Arial } against * { font-family: Verdana } table { font-family: Arial } And see which styles are applied to the cells of the table. Assuming the browser font size is set to 16px (i.e. The possibility to override the value of a component can be used in many ways. 5. Usually default font-size of the browser is 16px. (Note that CSS pixels are not device pixels; this will be discussed at length later) Other useful relative units. There is a difference between "applied to the whole document" and "applied to every element of the document" when you're dealing with cascading stylesheets. This method is non-conforming, use CSS color property on the element instead. This CSS type is a more efficient method, especially for styling a large website. This approach makes easier to manipulate global size, … To make it even easier to write style rules that depend only on the default font size, CSS has since 2013 a new unit: the rem. text Foreground color of text. And for the same reason, you might want to use the body to limit it only to the body area. The display property is one of the most commonly used features of CSS development. Follow these steps to use external CSS: The rem (for “root em”) is the font size of the root … More units in CSS. …to ensure the body is at most 900px and take 80% of the width of the viewport otherwise. the default), setting the font size of the html (root) element to 62.5% will default 1rem to 10px. Sequel to this, setting the font size of the html element in percentage is recommended. With external CSS, you’ll link your web pages to an external .css file, which can be created by any text editor in your device (e.g., Notepad++). Abstracting components behaviour #. A solution for this problem is percentage . How to change image size in CSS with CSS Tutorial, example on inline, hover, selector, background, border, display, float, font, margin, opacity, overflow, padding, position etc. The margin of the right of the body. Note that for an HTML document, the html selector will target the same thing as :root, though :root has a higher specificity (class vs. tag). 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