Site not responding to media query - html

Question

I'm using Windows 10, Codeigniter, jQuery and Firefox 43.0.4 although I can't see why that would affect this issue. I want to apply styles to an iPad size window so I'm using this media query:
#media only screen
and (min-device-width: 768px)
and (max-width: 1024px)
{
*{color:#ff0000 !important;}
}
as a test that should turn all text red but it's not working in Firefox 43.0.4 (or Chrome etc). I'm also using the Web Developer extension to set the portal to the correct size. I've used the head section metatag:
<meta name="viewport" content="width=device-width, initial-scale=1">
Probably obvious but I can't see it and I've used media queries before. This is driving me nuts and I would be grateful for any suggestions as to where I'm going wrong.

Answer 1

I believe you are missing the device prefix, the CSS should be:
#media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px) { /* STYLES GO HERE */}
You can read more information on Stephen Gilbert's site.

Answer 2

You dont have to use min-device-width, just use min-width
#media screen and (min-width:768px) and (max-width:1024px) {}

Answer 3

Try something like this:
#media only screen
and (max-width: 480px),(min-device-width: 768px)
and (max-device-width: 1024px)

Answer 4

I appear to have fixed the problem by using Mathew Riches code above and the reason I didn't recognize this earlier is that, for me, it doesn't work in a resized firefox browser window which has been my testbed of choice. To use the resized browser I need to use:
#media only screen
and (min-width : 768px)
and (max-width : 1024px) { /* STYLES GO HERE */}
but that doesn't work on my iPad 4. And inciddentally any use of:
and (-webkit-min-device-pixel-ratio: 2)
with a pixel ratio of 1 or 2 killed the response on my iPad 4.
So the only way to test has been to upload every change in CSS and check on the iPad itself which is pretty irritating as I normally use my local server for all development.
I then discovered a problem with full-screen background images on the iPad but that is another story...
Many thanks to all contributors for your thoughts and for my purposes I now regard this query as solved.