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align-content align-items align-self all animation animation-delay animation-direction animation-duration animation-fill-mode animation-iteration-count animation-name animation-play-state animation-timing-function backface-visibility background background-attachment background-blend-mode background-clip background-color background-image background-origin background-position background-repeat background-size border border-bottom border-bottom-color border-bottom-left-radius border-bottom-right-radius border-bottom-style border-bottom-width border-collapse border-color border-image border-image-outset border-image-repeat border-image-slice border-image-source border-image-width border-left border-left-color border-left-style border-left-width border-radius border-right border-right-color border-right-style border-right-width border-spacing border-style border-top border-top-color border-top-left-radius border-top-right-radius border-top-style border-top-width border-width bottom box-decoration-break box-shadow box-sizing break-after break-before break-inside caption-side caret-color @charset clear clip clip-path color column-count column-fill column-gap column-rule column-rule-color column-rule-style column-rule-width column-span column-width columns content counter-increment counter-reset cursor direction display empty-cells filter flex flex-basis flex-direction flex-flow flex-grow flex-shrink flex-wrap float font @font-face font-family font-feature-settings font-kerning font-size font-size-adjust font-stretch font-style font-variant font-variant-caps font-weight gap grid grid-area grid-auto-columns grid-auto-flow grid-auto-rows grid-column grid-column-end grid-column-gap grid-column-start grid-gap grid-row grid-row-end grid-row-gap grid-row-start grid-template grid-template-areas grid-template-columns grid-template-rows hanging-punctuation height hyphens @import isolation justify-content @keyframes left letter-spacing line-height list-style list-style-image list-style-position list-style-type margin margin-bottom margin-left margin-right margin-top max-height max-width @media min-height min-width mix-blend-mode object-fit object-position opacity order outline outline-color outline-offset outline-style outline-width overflow overflow-x overflow-y padding padding-bottom padding-left padding-right padding-top page-break-after page-break-before page-break-inside perspective perspective-origin pointer-events position quotes resize right row-gap scroll-behavior tab-size table-layout text-align text-align-last text-decoration text-decoration-color text-decoration-line text-decoration-style text-indent text-justify text-overflow text-shadow text-transform top transform transform-origin transform-style transition transition-delay transition-duration transition-property transition-timing-function unicode-bidi user-select vertical-align visibility white-space width word-break word-spacing word-wrap writing-mode z-index



CSS border-width Property


Example

Set a width for the borders:

div {border-width: thin;}
Try it Yourself »

More "Try it Yourself" examples below.


Definition and Usage

The border-width property sets the width of an element's four borders. This property can have from one to four values.

Examples:

  • border-width: thin medium thick 10px;
    • top border is thin
    • right border is medium
    • bottom border is thick
    • left border is 10px

  • border-width: thin medium thick;
    • top border is thin
    • right and left borders are medium
    • bottom border is thick

  • border-width: thin medium;
    • top and bottom borders are thin
    • right and left borders are medium

  • border-width: thin;
    • all four borders are thin

Note: Always declare the border-style property before the border-width property. An element must have borders before you can set the width.

Default value: medium
Inherited: no
Animatable: yes. Read about animatable Try it
Version: CSS1
JavaScript syntax: object.style.borderWidth="1px 5px" Try it

Browser Support

The numbers in the table specify the first browser version that fully supports the property.

Property
border-width 1.0 4.0 1.0 1.0 3.5


CSS Syntax

border-width: medium|thin|thick|length|initial|inherit;

Property Values

Value Description Play it
medium Specifies a medium border. This is default Play it »
thin Specifies a thin border Play it »
thick Specifies a thick border Play it »
length Allows you to define the thickness of the border. Read about length units Play it »
initial Sets this property to its default value. Read about initial Play it »
inherit Inherits this property from its parent element. Read about inherit

More Examples

Example

Set the width of the borders to medium:

div {border-width: medium;}
Try it Yourself »

Example

Set the width of the borders to thick:

div {border-width: thick;}
Try it Yourself »

Example

Set the width of the borders to 1px:

div {border-width: 1px;}
Try it Yourself »

Example

Set the width of the borders to 15px:

div {border-width: 15px;}
Try it Yourself »

Example

Set the width of the top and bottom borders to 10px, and the width of the left and right borders to 1px:

div {border-width: 10px 1px;}
Try it Yourself »

Related Pages

CSS tutorial: CSS Border

HTML DOM reference: borderWidth property