What is the best way to place a semi-transparent black overlay on an image?

<html>
<head>
<style>

#contain_main {background-color:black;
               width:100%;
               height:auto;}
               
#main {width:100%;
       height:700px;
       background-image:url("https://www.sappun.co.kr/shopimages/sappun/0090040002602.jpg?1581389206");
       background-repeat:no-repeat;
       background-position:center center;
       background-color:#dbdbdb;}

       
</style>
</head>
<body>

<div id="contain_main">
    <div id="main">
    </div>  
</div>

</body>
</html>

Is there a way to have the black #contain_main box overlay the #main div box? I've tried using z-index, position, and display properties but nothing seems to work. Any tips on how I can resolve this would be highly appreciated! :)

htmlcss

Answer №1

To create a cool effect, consider adding a sibling div to your image with a black background and reduced opacity (like div#overlay). By setting the parent div to position relative, you can then set the children divs to position absolute, align them to the top and left of the parent, and ensure that the black overlay has a higher z-index than the image so it appears on top.

<html>
<head>
<style>

#contain_main {width:100%;
               height:700px;
               position: relative;}
#overlay {position: absolute;
          top: 0;
          left: 0;
          background-color: #000;
          opacity: 0.5;
          width: 100%;
          height: 100%;
          z-index: 1;}
#image {position: absolute;
       top: 0;
       left: 0;
       width:100%;
       height:100%;
       background-image:url("https://www.sappun.co.kr/shopimages/sappun/0090040002602.jpg?1581389206");
       background-repeat:no-repeat;
       background-position:center center;
}



</style>
</head>
<body>

<div id="contain_main">
    <div id="overlay"></div>
    <div id="image"></div>  
</div>

</body>
</html>

Answer №2

If you want to stack a child within a parent, you can achieve this by using z-index:-1;.

Feel free to check out this interactive demo on JSFiddle.

  1. Set the parent element as relative.
  2. Apply absolute positioning along with z-index:-1; to the child element.

To demonstrate this effect, I added a padding:10px;, but you can remove it once you understand how it works.

#contain_main {
  background-color: black;
  width: 50%;
  height: 700px;
  position: relative;
  padding: 10px;
}

#main {
  width: 100%;
  height: 700px;
  background-image: url("https://www.sappun.co.kr/shopimages/sappun/0090040002602.jpg?1581389206");
  background-repeat: no-repeat;
  background-position: center center;
  background-color: gray;
  position: absolute;
  z-index: -1;
}
<html>

<head>
</head>

<body>
  <div id="contain_main">
    <div id="main">
    </div>
  </div>
</body>

</html>

Answer №3

One way to incorporate overlays into your design is by utilizing multiple background layers, including a gradient with an alpha value and a background image:


#container {
background-image: linear-gradient(rgba(255, 0, 0, 0.4), rgba(255, 0, 0, 0.4)), url(https://www.example.com/image.jpg);
}

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