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CSS Borders

CSS Box SizingCSS Margin and Padding

CSS borders allow us to visually separate, highlight, or frame elements. By combining borders, modern, aesthetic, and well-structured designs can be created.

Basic Border Settings

With the <border> property, we can set the border thickness, style, and color at once. Example: <border: 2px solid black;>.

In the following example, a <div> element is given a 2px thick black solid border:

Different Border Styles

Borders can have several styles: solid, dashed, dotted, double, groove, ridge, inset, and outset. These allow us to give varied appearances to elements.

Rounded Borders

With the <border-radius> property, we can round the corners of elements. It can be used for small rounding or even for creating fully circular elements.

Different Borders per Side

It is not required to set the same border for every side. <border-top>, <border-right>, <border-bottom>, and <border-left> can be controlled separately, so each side can have a different style.

Tips for Using Borders

Borders can help improve visual hierarchy and design. Some useful tips:

  • Choose a contrasting border color for better visibility.
  • Avoid overly thick borders, as they can interfere with content readability.
  • Use borders creatively, combine them with other styles (for example shadow, background color) to achieve a modern look.

Which CSS property sets the border thickness?

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