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Border Property
CSS Border
The CSS property border allows complete customization of the borders that appear around HTML elements. With HTML, it used to be impossible to place a border around an element, with the exception of tables. CSS Borders let you create crisp, custom border styles with very little work compared to antiquated HTML methods.
The border shorthand property sets all border properties in one declaration.
border: 1px solid #000;
The properties that can be set are (in order):
border-styleborder-widthborder-colorborder-radius
It does not matter if one of the values above is missing. For example, the following is valid CSS:
border: solid red;
Border Styles
The border-style property can be set to a wide range of different border types:
dotted- Sets a dotted border.dashed- Sets a dashed border.solid- Sets a solid border.double- Sets a double border.groove- Sets a 3D grooved border.ridge- Sets a 3D ridged border.inset- Sets a 3D inset border.outset- Sets a 3D outset border.none- Sets no border.hidden- Sets a hidden border.
Each side of the border doesn't need to match.
Each side can be styled separately:
border-top-style: solid;
border-left-style: dotted;
border-right-style: dashed;
border-bottom-style: double;
Or they can all be styled at once:
border-style: solid dashed double dotted;
The border property allows you to select each side of the element in one declaration in the following order: top, bottom, left, right.
Border Width
To alter the thickness of a border, use the border-width attribute. You may use key terms or exact values to define the border width.
Note: You must define a border-style for the border to appear. The width can be set as a specific size (in px, pt, cm, em, etc) or by using one of the three pre-defined values: thin, medium, or thick.
Example:
<style type="text/css">
table {
border-width: 7px;
border-style: outset;
}
td {
border-width: medium;
border-style: outset;
}
p {
border-width: thick;
border-style: solid;
}
</style>
Border Color
Now for the creative aspect of CSS Borders! With the use of the border-color property, you will be able to create customized borders to fit the flow and layout
of your website. Border colors can be any color defined by RGB, HSL, hexadecimal, or key terms.
Example:
<style type="text/css">
table {
border-color: rgb( 100, 100, 255);
border-style: dashed;
}
td {
border-color: #FFBD32;
border-style: ridge;
}
p {
border-color: blue;
border-style: solid;
}
</style>
Border-Radius
The border-radius property allows the corners of a border to be rounded. border-radius takes a length as its value which determines the degree of curvature for each corner of the element. The length can be in px or %.
border-radius: 25px;
Each corner of border-radius can be adjusted individually in the following order: top, bottom, left, right.
border-radius: 15% 10px 30% 5px;
Border-Image
The border-image property allows you to use an image as a custom border style. border-image is a shorthand for border-image-source, border-image-width, border-image-outset, and border-image-repeat.
border-image-source takes the url of the image you'd like to set as the border.
border-image-width sets the width of the image.
border-image-outsetsets the distance between the element and the border image.
border-image-repeat adjusts the way border images adjust to the element's edges.
Border: All in One
While it is nice that CSS allows a web developer to be very specific in creating a customized border, sometimes it's easier and less of a headache to create a uniform border in single line of CSS code. The border shorthand property allows us to declare a width, style, color, and radius.
Example:
<style type="text/css">
p { border: 20px outset blue; }
h4 { border: 5px solid; }
h5 { border: dotted; }
</style>
More Information:
Browser Support: IE6+