By editing one .css file, you can change your entire site at once. Photo by Alexandru Acea on Unsplash. This CSS type is a more efficient method, especially for styling a large website. And for the same reason, you might want to use the body to limit it only to the body area. 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). 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. topmargin The margin of the top of the body. Abstracting components behaviour #. …to ensure the body is at most 900px and take 80% of the width of the viewport otherwise. 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++). The rem (for “root em”) is the font size of the root … (Note that CSS pixels are not device pixels; this will be discussed at length later) Other useful relative units. 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. The possibility to override the value of a component can be used in many ways. Sequel to this, setting the font size of the html element in percentage is recommended. The display property is one of the most commonly used features of CSS development. Then create a function to return the breakpoint and append styles accordingly. the default), setting the font size of the html (root) element to 62.5% will default 1rem to 10px. 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. He keeps the root size defined in px, modules defined with rem units, and elements inside modules sized with em. 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). This approach makes easier to manipulate global size, … The following table enumerates a number of them: Several other CSS unit types support layout adaptation. Our web page treats every … The margin of the right of the body. text Foreground color of text. 5. More units in CSS. 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. Usually default font-size of the browser is 16px. Follow these steps to use external CSS: This method is non-conforming, use CSS margin-right property on the element instead. 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