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CSS3
Syntax & SelectorsColors & BackgroundsThe Box ModelCSS UnitsText & FontsDisplay & VisibilityPositioning & Z-IndexFlexboxCSS GridCombinatorsShadows & GradientsResponsive (Media Queries)Object Fit & CoverPseudo-classes & ElementsTransitions & AnimationsCSS Variables
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Syntax & SelectorsColors & BackgroundsThe Box ModelCSS UnitsText & FontsDisplay & VisibilityPositioning & Z-IndexFlexboxCSS GridCombinatorsShadows & GradientsResponsive (Media Queries)Object Fit & CoverPseudo-classes & ElementsTransitions & AnimationsCSS Variables

The Box Model

The CSS Box Model is essentially a box that wraps around every HTML element. It consists of: margins, borders, padding, and the actual content.
css
div {
  width: 300px;
  border: 15px solid green;
  padding: 50px;
  margin: 20px;
}
Always use box-sizing: border-box; to include padding and border in the element's width.
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