Bootstrap - Custom CSS styles applied to specific grid prefixes

I am currently working on developing a mobile site using bootstrap and I have a need to apply different CSS rules based on the grid prefix: col-xs, col-sm

Here is a snippet of the HTML code:

<header class="col-xs col-sm">
   Hi
</header>

For the CSS styling:

header.col-md{
    background-color:red;   
}

header.col-sm{
    background-color:green;
}

Can anyone provide advice on how to correctly implement this? Thanks!

Answer №1

.col-xs, .col-sm, .col-md and .col-lg are not part of the Bootstrap framework's predefined classes. The .navbar component in Bootstrap serves as their header element and is already designed to be responsive.

If you want to create custom classes that function according to your design requirements, you can utilize media queries. However, it's important to note that .col-xs should not be placed within a media query (assuming the default breakpoints from Bootstrap 3.x are being used):

header.col-xs {styles}

@media (min-width:768px) {

  header.col-sm {styles}

}

@media (min-width:992px) {

  header.col-md {styles}

}

@media (min-width:1200px) {

  header.col-lg {styles}

}

To enhance clarity and accuracy, especially since a header is distinct from a column, consider renaming these classes to .header-xs, .header-sm, .header-md, .header-lg. Alternatively, you could forego using size-specific classes altogether and craft your header design solely through media queries:

.header { base header styles applicable across all viewport widths }

    @media (min-width:768px) {

      .header {additional styles specific to this viewport width }

    }

and continue implementing similar approaches...

Answer №2

If you're looking to enhance your CSS selector specificity, consider using a more unique identifier like an id.

<header id="my-header" class="col-xs col-sm">
   Hi
</header>

CSS:

#my-header.col-md{
    background-color:red;   
}

#my-header.col-sm{
    background-color:green;
}

By increasing the specificity of your selector, you can override bootstrap's default styles and ensure that your styles are applied by the browser.

For further insight into specificity in CSS, check out:

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