display child element at full width within a parent element that is not full width

I have a container with a maximum width of 1024px, and I want one of its child elements to take up 100% width starting from the left edge of the screen.

Is there a way to achieve this without adding extra HTML markup? I know I can make the child element 100% width using width: 100vw;, but I'm having trouble aligning it to the left.

Here's my current CSS:

.parent {
  max-width: 800px;
  margin: 0 auto;
}

.child {
  margin-top: 20px;
  padding: 20px;
  width: 100vw;
  background: grey;
}
<div class="parent">
  <a href="#" class="toggle">Toggle content</a>
  <div class="child">Content</div>
</div>

You can see the issue in action on this CodePen link.

htmlcsswidth

Answer №1

Success!

.element {
  position: relative;
  margin-top: 10px;
  padding: 15px;
  width: 80vw;
  background: light grey;
  left: 20px;
  box-sizing: border-box;
}

Answer №2

Is there a way to accomplish this without adding any extra markup? I know that you can make the child element take up 100% width using width: 100vw; but I'm having trouble aligning it to the left.

Are you trying to move the child element to the left? If so, keep in mind that the parent element has margin-left: auto and margin-right: auto (or shorthand margin: 0 auto), which centers it along with the child element.

You could try using margin: 0; instead.

Answer №3

To achieve this effect, you can utilize absolute positioning on pseudo elements. In order to prevent a horizontal scroll from appearing, I had to include a wrapper with overflow hidden. There may be alternative solutions using the wrapper that someone could explore.

https://codepen.io/anon/pen/ABC123

.wrapper {
  overflow:hidden;
  margin-top:40px;
}

.parent {
  max-width: 800px;
  margin: 0 auto;
}

.child {
  margin-top: 20px;
  padding: 20px;
  width: 100%;
  background: grey;
  position:relative;
}

.child:before, .child:after {
  content:"";
  position:absolute;
  top:0;
  height:100%;
  width:100%;
  background:grey;
}
.child:before {
  left:-100%;
}
.child:after {
  right:-100%;
}
<div class="wrapper">
  <div class="parent">

   <a href="#" class="toggle">Toggle content</a>

   <div class="child">Content</div>

  </div>
</div>

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