Increase the size of the box-shadow so that it extends beyond the boundaries

Can we create a wider box-shadow in CSS than the actual HTML element it is being applied to, while maintaining the same height as the element? Increasing the spread of the shadow typically increases the height as well. In the provided code snippet, the maximum width of the box-shadow matches the width of the .box div. Is there a specific reason that limits the box shadow from extending beyond the HTML element's boundaries, or is there a restriction on this?

.container {
  background-color: gray;
  height: 100px;
  width: 100px;
}
.box {
  background-color: blue;
  height: 50px;
  width: 50px;
  box-shadow: 55px 0px 0px 0px rgba(0, 0, 0, .2);
}
.container-spread {
  background-color: gray;
  height: 100px;
  width: 100px;
}
.box-spread {
  background-color: blue;
  height: 50px;
  width: 50px;
  box-shadow: 55px 0px 0px 5px rgba(0, 0, 0, .2);
}
<div class="container">
  <div class="box">box</div>
  container
</div>

<br>
<br>

<div class="container-spread">
  <div class="box-spread">box</div>
  container
</div>

Answer №1

To enhance the element and add a box-shadow effect, you can utilize the pseudo element along with applying box-shadow. Setting height: 100% ensures that the height of the box-shadow matches the element. Adjusting the width value will be crucial in this process.

.container {
  background-color: gray;
  height: 100px;
  width: 100px;
}
.box {
  background-color: blue;
  height: 50px;
  width: 50px;
  position: relative;
}
.box::after {
  box-shadow: 85px 0 0 0 rgba(0, 0, 0, 0.2);
  content: " ";
  height: 100%;
  position: absolute;
  left: -50%;
  top: 0;
  width: 150%;
}
<div class="container">
  <div class="box">box</div>
  container
</div>

Answer №2

Although you can't use the spread-radius value to stretch the shadow only in the horizontal or vertical directions, you have the option of adding multiple drop shadows to a single element. The drawback is that overlapping shadows will create darker regions, but with a bit of calculation, you can align them easily.

Learn more about box-shadow at MDN

.container{ background-color:gray; height:100px; width:100px; }
.box{ background-color:blue; 
    height:50px; 
    width:50px; 
    box-shadow:55px 0px 0px 0px rgba(0,0,0,.2),
               105px 0px 0px 0px rgba(0,0,0,.2),
               155px 0px 0px 0px rgba(0,0,0,.2) ; }
<div class="container">
  <div class="box">box</div>
  container
</div>

Answer №3

Although the box-shadow property includes a spread setting, it affects all sides uniformly. Unfortunately, there doesn't seem to be a way to independently adjust the horizontal or vertical size of a box shadow.

One workaround could involve using multiple box shadows to create the desired effect, but this method is only effective when the spread is set to 0.

.container{ background-color:gray; height:100px; width:100px; }
.box{ background-color:blue; height:50px; width:50px;
  box-shadow: 
     55px 0px 0px 0px rgba(0,0,0,.2),
     5px 0px 0px 0px rgba(0,0,0,.2); }
<div class="container">
  <div class="box">box</div>
  container
</div>

Answer №4

Perhaps this could be useful for you

.container{ background-color:gray; height:100px; width:100px; }
.box{ background-color:blue; height:50px; width:50px; box-shadow:0px 0px 2px rgba(0,0,0,1); }
<div class="container">
  <div class="box">box</div>
  container
</div>

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