Guide to adjusting the transparency of a card section in Bootstrap 4

Hi there, I am working on a simple Card Bootstrap 4 component.

<div class="card">
    <div class="card-header">This is the header</div>
    <div class="card-block">This is the content block</div>
    <div class="card-footer">This is the footer</div>
</div>

I have a specific requirement where I need the header and footer to have an opacity of 1, while the block should have an opacity of 0.4. I attempted using rgba in the background-color style but encountered some difficulties.

.card-block { background-color: rgba(245, 245, 245, 0.4); }
csstwitter-bootstrapopacitybootstrap-4twitter-bootstrap-4

Answer №1

Have you experimented with utilizing the opacity property?

.special-card {
/* By creating a custom class, you can avoid conflicts 
   with Bootstrap styles and improve specificity.
   This approach is more effective than using !important 
   notation (your future self will be grateful)*/

  background-color: rgba(245, 245, 245, 1);
  opacity: .4;
}
<div class="card">
  <div class="card-header">This is my header</div>
  <div class="card-block special-card">This is my block</div>
  <div class="card-footer">This is my footer</div>
</div>

Answer №2

Give this a shot:

<div class="custom-card">
  <div class="card-heading">Here's my heading</div>
  <div class="card-content special-section" style="background-color: rgba(245, 245, 245, 0.4); ">This is my content</div>
  <div class="card-end">This concludes my card</div>
</div>

Answer №3

It turns out that the bootstrap class .card was causing some issues with the background opacity CSS style I wanted to apply to .card-block, even when using the !important keyword.

I managed to resolve this issue by including the background style in the card itself and adjusting the opacity of .card-header and .card-footer individually to 1.

.card { background-color: rgba(245, 245, 245, 0.4); }
.card-header, .card-footer { opacity: 1}

Answer №4

Give this method a try!

HTML

<div class="card text-white bg-success mb-3 mt-4" style= "">
    <div class="card-header">User</div>
    <div class="card-body special-card" style="">
        <h5 class="card-title">Primary card title</h5>
        <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
    </div>
</div>
<div class="card text-white bg-primary mb-3" style=" ">
    <div class="card-header">Linked staff profile</div>
    <div class="card-body special-card">
        <h5 class="card-title">Secondary card title</h5>
        <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
    </div>
</div>
<div class="card text-white bg-danger mb-3" style=" ">
    <div class="card-header">Staff profile access rights</div>
    <div class="card-body special-card">
        <h5 class="card-title">Success card title</h5>
        <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
    </div>
</div>

CSS

 .special-card {
            background-color: rgba(245, 245, 245, 0.4) !important;
        }

https://i.sstatic.net/frhHt.png

Answer №5

It seems like your CSS is fine. The problem might be that your Bootstrap file is taking precedence over your code. You can try the following to override it, but using !important is not recommended:

.card-block { background-color: rgba(245, 245, 245, 0.4) !important; }

You can check out this link for more information on how to handle overrides. This concept is known as specificity.

Answer №6

Opacity and background-color serve different purposes in web design. While opacity determines the transparency of an element, background-color solely affects the color of the background.

Although they may seem similar at first glance, their functionalities are distinct from each other.

The major distinction lies in the fact that setting opacity will make all text, images, and child elements transparent, whereas changing the background-color only alters the col...you catch my drift ;)

Answer №7

Here are some custom sass variables that I've used to change background colors and styling within an accordion:

::ng-deep div.card-header:hover {
background-color: var(--custom-hover-color);
}

::ng-deep div.card-header a {
background-color: var(--custom-accent-color);
text-decoration: none !important;
}

::ng-deep div.card-body {
background-color: var(--custom-background);
}

Answer №8

With Bootstrap 4, you can easily adjust the opacity of elements by simply adding classes like "opacity-50", which corresponds to an opacity of 0.5 in CSS. Similarly, "opacity-30" translates to an opacity of 0.3 without the need to write any additional CSS code.

`<div class="card">
    <div class="card-header">This is my header</div>
    <div class="card-block opacity-50">This is my block</div>
    <div class="card-footer">This is my footer</div>
</div>`

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