How to create a faded effect on a background image within a bootstrap carousel

Can anyone help me figure out how to make my images darker in order to enhance the readability of the text on them? I am using a bootstrap carousel theme and struggling to achieve the desired darkness. Opacity adjustments are affecting the transparency of the text as well. I have attempted to use linear-gradient but it doesn't seem to be taking effect. I've tested it across all classes, not just the image class slide.

.slide {
  background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7));
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" rel="stylesheet"/>
<div class="carousel-inner" role="listbox">
  <div class="item active">
    <img class="slide"  src="http://placehold.it/800x300" alt="First slide">
    <div class="container">
      <div class="carousel-caption">
        <h1>Welcome to GroupWrites.</h1>
        <p>Where creative writing meets social media. Discover our community of writers and readers and experience social writing. </p>
        <p><a class="btn btn-lg btn-primary" href="/register" role="button">Sign up today</a></p>
      </div>
    </div>
  </div>
</div>

cssbootstrap-4

Answer №1

Changing the background of the <img> element may not work as expected if the image is not transparent or missing. To overlay the image with a semi-transparent background, you can use the :after or :before pseudo-elements.

You can apply the pseudo-class to .item or .carousel-inner to darken the image while keeping the text unaffected.

.item:after {
  content:"";
  position:absolute;
  top:0;
  bottom:0;
  left:0;
  right:0;
  background:rgba(0,0,0,0.6);
}
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<div class="carousel-inner" role="listbox">
  <div class="item active">
    <img class="slide" src="http://placehold.it/800x300" alt="first slide">
    <div class="container">
      <div class="carousel-caption">
        <h1>Welcome to GroupWrites.</h1>
        <p>Where creative writing meets social media. Discover our community of writers and readers and experience social writing.</p>
        <p><a class="btn btn-lg btn-primary" href="/register" role="button">Sign up today</a></p>
      </div>
    </div>
  </div>
</div>

Answer №2

Placing a background image on an img element is ineffective because, as expected, the background image remains in the background and is hidden by the actual image itself.

To achieve the desired effect, you should superimpose a semi-transparent background over your image. This can be accomplished by setting a background for the parent div of the image and ensuring it has a higher z-index than the image.

.item {
  width: 400px;
  height: 300px;
}
.item.active {
  background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.2));
}
.item .slide {
  position: relative;
  z-index: -1;
  width: 400px;
  height: 300px;
}
<div class="item">
  <img class="slide"  src="http://placehold.it/400x300" alt="First slide">
</div>
<div class="item active">
  <img class="slide"  src="http://placehold.it/400x300" alt="First slide">
</div>

Answer №3

To achieve this effect, make sure to include the following CSS code:

.carousel-caption{
  width:100%;
  height:100%;
  left:0;
  right:0;
  bottom:0;
  background-color:rgba(0,0,0,0.2);
}

For a live demonstration, check out the JSfiddle link provided: https://jsfiddle.net/ghayyourspyko/tc0ksnex/1/

Another method to accomplish this is shown below:

.item{
Position:relative;
}
.item:after {
  content:"";
  display:block;
  position:absolute;
  top:0;
  bottom:0;
  left:0;
  right:0;
  background:rgba(0,0,0,0.6);
}

View the implementation on JsFiddle here: https://jsfiddle.net/ghayyourspyko/jscgdLdu/1/

Answer №4

If you want to create a darker background effect on your Bootstrap 5 carousel, one trick is to use the "::before" pseudo-element along with a linear gradient overlay featuring a semi-transparent black color (rgba(0, 0, 0, 0.5)) on top of your image.

To achieve this effect, simply insert the following CSS snippet into the carousel item:

  .item::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5));
}

Answer №5

If you're looking to adjust the darkness of an image, one way is to utilize the brightness filter:

body{
  font-family:calibri;
}

div {
  width:200px;
  padding:20px;
  color:#fff;
  position:relative;
  text-align:center;
}

div img{
  position:absolute;
  top:0;
  left:0;
  width:100%;
  height:180px;
  z-index:-1;
  border-radius:8px;
  filter:brightness(40%); /* Experiment with filter for different levels of darkness */
}
<div>
 <img src="//picsum.photos/250" />
 <h2>Heading</h2>
 <p>This is my first paragraph</p>
 </div>

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