What is the correct way to align a shape with a border width in the center of its parent input button?

My newsletter subscription box features a form that spans the entire width of its parent element, causing the button to fill up all available space.

To add a visual touch, I used the before CSS pseudo-element to create a small 'arrow' shape above the Subscribe button.

The issue arises when the viewport width is decreased, as the arrow fails to align properly with the center of the button. This misalignment can be observed here:

What steps can I take to rectify this alignment problem?

JSFiddle: http://jsfiddle.net/ahmadka/7965p/

CodePen (JSFiddle is down sometimes): http://codepen.io/anon/pen/qFvbc

css

Answer №1

If you need to center an element that is positioned absolutely and has a known width, here's my go-to method:

left: 50%;
margin-left: -[half of the element's width]px;

To fix your issue, try adding magin-left: -12px; to your .form-wrapper button:before selector.

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