Css: Setting Background-Image in CSS

How to add a color overlay to a background image?

I see 2 easy options:

multiple background with a translucent single gradient over image
huge inset shadow

gradient option:

    html {
      min-height:100%;
      background:linear-gradient(0deg, rgba(255, 0, 150, 0.3), rgba(255, 0, 150, 0.3)), url(https://picsum.photos/id/1043/800/600);
      background-size:cover;
    }

Set background image and color in css

Add z-index:-1; to your pseudo element #canvas-preview::before to make visible the Text

As it comes over the #canvas-preview as a layer and works as fallback in case your bg-image won't load.

So to make visible the text-layer over that you need to lower the z-index of your pseudo element.

Updated Code Snippet

#canvas-preview {  width: 200px;  border: 1px solid #000000;  box-sizing: border-box;  position: relative;  background-image: url(https://hd.unsplash.com/photo-1463950922781-0e6d07cbd146);}#canvas-preview::before {  background-color: rgba(0, 128, 0, 0.5);  content: '';  display: block;  height: 100%;  position: absolute;  width: 100%;  z-index: 1;}#custom-canvas {  margin: 10px;  color: #ffffff;  z-index: 2;  position: relative;}

<div id="canvas-preview">  <div id="custom-canvas">There is some text</div></div>

CSS: Setting background-image in CSS

Depending on your folder structure and where the CSS is located relative to the images it is using you will have to go up to the root level of the image directory and access it from there so you could maybe try something like

background-image: url('/../images/bgimage.jpg');

How to put text color as a background image using CSS?

Here is a solution using mix-blend-mode: screen;

https://jsfiddle.net/08rh23tw/

.card-text {
  background: white;
  color: #000;
  height: 100%;
  mix-blend-mode: screen;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 80px;
  text-align: center;
  padding: 30px;
}

.card {
  width: 400px;
  height: 600px;
}

<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" rel="stylesheet"/>
<div class="card bg-dark text-white">
    <img src="https://images.pexels.com/photos/1005417/pexels-photo-1005417.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=100&w=240" 
    class="card-img" alt="...">
    <div class="card-img-overlay">
     
      <p class="card-text">
        Content here.
      </p>      
    </div>
  </div>

html load background image lower quality

You could scale the image proportionally to itself with just HTML and CSS but the browser would still load the whole image into memory.

You would need to use some photo editing software to change the resolution of the image and image format to JPEG, which has a better compression algorithm than the PNG image format.

HTML:

<div class="img_resz">
    <img src="img.jpg">
</div>

CSS:

.img_resz img 
{
    width: 90%;
}

CSS Won't Display Background Image?

Try this solve and make you sure give the height.

background-image: url("../images/alfredo_dover.jfif");