modifying wordpress style sheet for all devices

I am using inspect element to target the elements that need to be modified in wordpress.  However, I am running into issues.  For instance, I modified the h2 and h3 tags.  The changes look good on the desktop but when I view it on smaller devices, the change doesn't resize for the smaller screens.  I assume the change supersede the media setting but am not sure how or where to change the media setting since the style sheet I am using has over 2,000 lines!
nsitedesignsAsked:
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Tom BeckCommented:
Rather than use the Inspect Element feature, open View --> Developer --> Developer Tools in Chrome.

Click the "Toggle Device Mode" icon on the left side of the Developer Tools menu (next to the "Search" magnifying glass). You can simulate any mobile device size from there.

While on the Elements menu item click to highlight any element in the source code and the css for that element appears on the right column. What file and what line number the css is coming from is clearly indicated for each css definition.

Now you know exactly where you have to go to make changes for any mobile device size. Turn off "Toggle Device Mode" to inspect elements for desktop sizes.

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nsitedesignsAuthor Commented:
oh baby that is cool!  I assume nothing like this exists in FF eh?
lenamtlCommented:
In your CSS file
check for line that start with @media
example: @media (min-width: 700px) { ... }

https://developer.mozilla.org/en-US/docs/Web/CSS/Media_Queries/Using_media_queries

I'm using Bootstrap to have a responsive website with not much code to edit.
http://getbootstrap.com/css/#grid-media-queries
Tom BeckCommented:
FF does not have a feature similar to Chrome's "Device Mode". Maybe soon though. I should say, I've never found such a feature in FF and I use Firebug most of the time for debugging.

Thanks for the points.
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