Centered CSS Box with Pointing Arrow

I'm looking for a way to create a unique div design that includes an arrow pointing downwards attached to the bottom. After some exploration, I was able to achieve this look through this process: http://jsfiddle.net/hyH48/.

However, my challenge lies in centering the arrow within the div. In the fiddle provided, the arrow is centered using:

left: 20px;

Is there a dynamic way to ensure that the arrow always appears in the center? Given that users may have different screen resolutions when viewing the page, I can't anticipate the exact integer to use here.

Your assistance would be greatly appreciated!

css

Answer №1

If you're unsure of the arrow's width, here's a solution that may help (demo):

left: 50%;
margin-left: -20px; /* -(width/2)px */

Alternatively, if you do know the width, you can utilize transforms with left: 50%:

left: 50%;
transform: translateX(-50%);

Answer №2

To achieve the desired effect, include left:50%; and margin-left:20px; within the styling for #mybox:after. For a visual representation, refer to this link: http://example.com/unique-link

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