outline:1px solid white;
This won't add the extra width and height.
Answer from abenson on Stack OverflowW3Schools
w3schools.com › cssref › pr_border-width.php
CSS border-width property
Set the width of the top and bottom borders to 10px, and the width of the left and right borders to 1px: ... If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail: [email protected] · If ...
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › CSS › Reference › Properties › border
border - CSS | MDN
2 weeks ago - Sets the thickness of the border. Defaults to medium if absent.
Border Vs. Border-Width - HTML & CSS - SitePoint Forums | Web Development & Design Community
In the following code, if there is both border and border-width, than border-width controls the width. Border controls the width when there is no border-width. Is this normal, maybe it is set so if the border-width doesn’t work in a browser there is a backup style? More on sitepoint.com
1
September 2, 2023How to give border to any element using css without adding border-width to the whole width of element? - Stack Overflow
231 When 1 px border is added to div, Div size increases, Don't want to do that ... 0 Highlighting elements by adding a border and changing ancestor's display style changes the page layout · 0 How can I make a border with CSS around some elements without specifing an absolute width? More on stackoverflow.com
html - How do I set border width with CSS? - Stack Overflow
Why does this work? I get the same result in Chrome and in IE9. More on stackoverflow.com
html - Border Height on CSS - Stack Overflow
I have a table TD and on the right of it I want to add a 1 pixel border, so I've done this: table td { border-right:1px solid #000; } It works fine but the problem is that the border's height ... More on stackoverflow.com
Videos
11:33
It might be time to rethink box-sizing: border-box - YouTube
02:36
Learn CSS borders in 2 minutes 🔲 - YouTube
01:55
Learn How to Set Border Width in CSS | border width property | ...
01:55
How to Set Border Width in CSS | border-width property | Amit Thinks ...
04:27
Learn CSS borders in 4 minutes! 🖼 - YouTube
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › CSS › Reference › Properties › border-width
border-width - CSS | MDN
2 weeks ago - /* Keyword values */ border-width: thin; border-width: medium; border-width: thick; /* <length> values */ border-width: 4px; border-width: 1.2rem; /* top and bottom | left and right */ border-width: 2px 1.5em; /* top | left and right | bottom */ border-width: 1px 2em 1.5cm; /* top | right | ...
SitePoint
sitepoint.com › html & css
Border Vs. Border-Width - HTML & CSS - SitePoint Forums | Web Development & Design Community
September 2, 2023 - border-width: 5px; It will assign border-width shorthand CSS property and sets the widths of all four sides of an element’s border .
W3Schools
w3schools.com › css › css_border_width.asp
CSS Border Width
The border-width property specifies the width of the four borders. 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:
W3Schools
w3schools.com › cssref › pr_border.php
CSS border property
border: border-width border-style border-color|initial|inherit; ... If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail: [email protected] · If you want to report an error, or if you want to make a suggestion, send us an e-mail: [email protected] · HTML Tutorial CSS Tutorial JavaScript Tutorial How To Tutorial SQL Tutorial Python Tutorial W3.CSS Tutorial Bootstrap Tutorial PHP Tutorial Java Tutorial C++ Tutorial jQuery Tutorial
Tailwind CSS
tailwindcss.com › docs › border-width
border-width - Borders - Tailwind CSS
<div class="border-t-4 border-indigo-500 ..."></div><div class="border-r-4 border-indigo-500 ..."></div><div class="border-b-4 border-indigo-500 ..."></div><div class="border-l-4 border-indigo-500 ..."></div>
Bootstrap
getbootstrap.com › docs › 5.3 › utilities › borders
Borders · Bootstrap v5.3
"border": ( property: border, values: ( null: var(--#{$prefix}border-width) var(--#{$prefix}border-style) var(--#{$prefix}border-color), 0: 0, ) ), "border-top": ( property: border-top, values: ( null: var(--#{$prefix}border-width) var(--#{$prefix}border-style) var(--#{$prefix}border-color), 0: 0, ) ), "border-end": ( property: border-right, class: border-end, values: ( null: var(--#{$prefix}border-width) var(--#{$prefix}border-style) var(--#{$prefix}border-color), 0: 0, ) ), "border-bottom": ( property: border-bottom, values: ( null: var(--#{$prefix}border-width) var(--#{$prefix}border-style)
Top answer 1 of 12
298
outline:1px solid white;
This won't add the extra width and height.
2 of 12
40
Check out CSS box-sizing...
The box-sizing CSS3 property can do this. The border-box value (as opposed to the content-box default) makes the final rendered box the declared width, and any border and padding cut inside the box. You can now safely declare your element to be of 100% width, including pixel-based padding and border, and accomplish your goal perfectly.
- -webkit-box-sizing: border-box; /* Safari/Chrome, other WebKit */
- -moz-box-sizing: border-box; /* Firefox, other Gecko */
- box-sizing: border-box; /* Opera/IE 8+ */
I'd suggest creating a mixin to handle this for you. You can find more information on box-sizing at W3c http://www.w3schools.com/cssref/css3_pr_box-sizing.asp
Top answer 1 of 7
112
Doing borders on tables with css is a bit more complicated (but not as much, see this jsfiddle as example):
table {
border-collapse: collapse;
border: 1px solid black;
}
table td {
border: 1px solid black;
}<table>
<tr>
<td>test</td>
<td>test</td>
</tr>
</table> 2 of 7
15
The default border-style is none, so you must specify that as well as the width and the colour.
You can use the border shorthand property to set all three values in one go.
Also, the border attribute describes the border for the table and the cells. CSS is much more flexible so it only describes the border of the elements you are selecting. You need to select the cells too in order to get the same effect.
table, th, td {
border: solid black 1px;
}
See also border properties and tables in CSS.
GeeksforGeeks
geeksforgeeks.org › css › css-border-width-property
CSS Border Width Property %%page%% %%sep%% %%sitename%% - GeeksforGeeks
July 11, 2025 - <!DOCTYPE html> <html> <head> <title> ... </head> <body> <h1 style="color: green"> GeeksforGeeks </h1> <p>border-width: 5px 10px 15px 20px</p> <!-- This div has different border widths for each side --> <div style="border-width: ...
GeeksforGeeks
geeksforgeeks.org › css › how-to-set-border-width-in-css
How to Set Border Width in CSS? - GeeksforGeeks
July 23, 2025 - <!DOCTYPE html> <html> <head> <title>Border Width</title> <style> /* Set border width for all sides */ .GFG { /* 2 pixels width for all sides */ border: 2px solid black; padding: 10px; } </style> </head> <body> <div class="GFG"> Welcome to ...
Top answer 1 of 12
134
I have another possibility. This is of course a "newer" technique, but for my projects works sufficient.
It only works if you need one or two borders. I've never done it with 4 borders... and to be honest, I don't know the answer for that yet.
.your-item {
position: relative;
}
.your-item:after {
content: '';
height: 100%; //You can change this if you want smaller/bigger borders
width: 1px;
position: absolute;
right: 0;
top: 0; // If you want to set a smaller height and center it, change this value
background-color: #000000; // The color of your border
}
2 of 12
68
No, there isn't. The border will always be as tall as the element.
You can achieve the same effect by wrapping the contents of the cell in a <span>, and applying height/border styles to that. Or by drawing a short vertical line in an 1 pixel wide PNG which is the correct height, and applying it as a background to the cell:
background:url(line.png) bottom right no-repeat;
Mimo
mimo.org › glossary › css › border-width
CSS border-width: Customize element borders effortlessly
Instead of using border-top or border-bottom, logical properties like border-block help maintain consistency in different writing directions: ... This applies the same width to the block-start and block-end sides, adapting to text direction settings. The CSS border-width property offers flexibility when designing web elements.
HTML Dog
htmldog.com › references › css › properties › border-width
CSS Property: border-width | HTML Dog
Border width can be set on sides independently with border-top-width, border-right-width, border-bottom-width, and border-left-width.
Programiz
programiz.com › css › border-width
CSS border-width Property (With Examples)
CSS border-width property specifies the width or thickness of the element's border.
Tailwind CSS
tailwindcss.com › docs › border-style
border-style - Borders - Tailwind CSS
Prefix a border-style utility with a breakpoint variant like md: to only apply the utility at medium screen sizes and above:
Littlewebhut
littlewebhut.com › css › border_width
CSS border-width Property
CSS border-width Property - Usage, Examples, and Testing for CSS 2.1.
TechOnTheNet
techonthenet.com › css › properties › border_width.php
CSS: border-width property
This CSS tutorial explains how to use the CSS property called border-width with syntax and examples. The CSS border-width property defines the border width of a box.
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › CSS › border-inline-width
border-inline-width - CSS | MDN
August 5, 2025 - /* <'border-width'> values */ border-inline-width: 5px 10px; border-inline-width: 5px; border-inline-width: thick; /* Global values */ border-inline-width: inherit; border-inline-width: initial; border-inline-width: revert; border-inline-width: revert-layer; border-inline-width: unset;