"Enhancing Website Styling with Twitter Bootstrap's Border

Recently delving into the realm of Twitter Bootstrap, I find myself pondering on the best approach to incorporate a border around a parent element.

Consider this scenario:

<div class="main-area span12">
    <div class="row">
       <div class="span9">
            //Possibly some descriptive text
       </div>
       <div class="span3">
            //Perhaps a button or similar element
       </div>
    </div>
</div>

If I try to add a border using the following CSS:

.main-area {
    border: 1px solid #ccc;
}

The grid layout will shift and push the span3 element down to the next row due to the increase in overall width caused by the border..... How can one effectively apply styles like borders or padding to parent <div> elements in such cases?

csstwitter-bootstrap

Answer №1

If you take a look at Twitter's demonstration of borders within their grid system on GitHub from container-app.html, you can gain insight into how they implement this design element.

One specific example is shown below where they outline the fundamentals of their 16-column grid system that spans 940 pixels:

.row {
    zoom: 1;
    margin-left: -20px;
}

.row > [class*="span"] {
    display: inline;
    float: left;
    margin-left: 20px;
}

.span4 {
    width: 220px;
}

To accommodate borders on certain elements, they introduce internal CSS that adjusts classes to compensate for the border(s).

For instance, to incorporate a left border on the sidebar, they integrate the following CSS snippet in the <head> section after the primary 

<link href="../bootstrap.css" rel="stylesheet">
.

.content .span4 {
    margin-left: 0;
    padding-left: 19px;
    border-left: 1px solid #eee;
}

In this case, the padding-left is decreased by 1px to accommodate the additional left border. As this rule is later in the source hierarchy, it takes precedence over prior declarations.

While not the most sophisticated or elegant method, this serves as a fundamental illustration.

Answer №2

Here's a handy solution I came across recently that worked perfectly for my requirements - simply adding the box-sizing attributes:

-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;

By including these attributes, it ensures that the border is included in the overall width and height of the box model, effectively resolving any related issues.

As per caniuse.com » box-sizing, box-sizing has support from IE8 onwards.

If you happen to be using LESS or Sass, there's also a Bootstrap mixin available for this purpose.

For LESS:

.box-sizing(border-box);

And for Sass:

@include box-sizing(border-box);

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