This won't center.

Hi,

Please see attached. This won't center. I need to do it via class not ID.
test.html
LVL 3
Computer GuyAsked:
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RobOwner (Aidellio)Commented:
add:

display: block;

i.e.

.test-header {
  font-weight:bold;
  font-family: 'Arial Narrow', Arial, sans-serif;
  text-transform:uppercase;
  text-align:center;
 display: block;
}

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Computer GuyAuthor Commented:
What is the theory behind that?
RobOwner (Aidellio)Commented:
a span element is an inline element, not a bock element. by forcing it to be a bock element you have control over its positioning.
RobOwner (Aidellio)Commented:
These articles from the MDN reference can explain it better than me.  It's more about what a span element isn't rather than is when it comes to a Block-level element.

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/span
https://developer.mozilla.org/en-US/docs/Web/HTML/Block-level_elements
https://developer.mozilla.org/en-US/docs/Web/HTML/Inline_elemente
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