Note
Before suggesting a solution, it's important to mention that the approach discussed here involves breaking the Box flow model. It is not recommended as it may lead to inconsistent results across various browsers.
However, achieving what you want is feasible. While using javascript might be easier in some cases, below is a CSS-based solution:
1. Breaking out of the box model
float: left;
width: 200%;
margin-left: -50%;
text-align: center;
The float CSS property allows an element to be taken from the normal flow and positioned along the left or right side of its container, with text wrapping around it.
The width of the container is still relative to its parent, so scaling it up using % units requires adjusting for responsiveness. In this example, overcompensation is used.
To keep the element centered, a negative margin equal to half of the overflow is employed. The desired effect is achieved by ensuring that the box is fully visible and centered within the viewport using text-align.
2. Allowing Overflows
Applying overflow: visible to the parent elements prevents hiding of floated elements extending beyond their boundaries due to overflow: hidden.
Make sure to include:
#post-body, .content-posts-wrap {
overflow: visible;
}
This affects elements like #post-body and .content-posts-wrap.
3. Introducing a Properly Sized Element
Create a nested element of correct width within the oversized container for your slider. Apply the following CSS properties:
display: inline-block;
width: 100vw;
text-align: left;
Using display: inline-block, you ensure adherence to the specified width rule within the box model. The vw (viewport width) units simplify sizing, but alternate solutions can be explored if compatibility issues arise.
Resetting the text-align aligns content correctly within the designated space.
4. Including a Clearing Div
To handle the altered layout flow, add a clearing element after the parent slider:
This element determines whether items can sit adjacent to preceding floating elements or should be shifted below them. For more information, refer to the source.
A basic <div> element suffices:
clear: both;