img resize wordpress

Hi,

In wordpress I add a header image. Then I want the image to resize on different devices but it  doesnt . In the syle.css it says this so why doesnt the header image resize?

#headimg img {
	-webkit-box-shadow: 0 0 10px 0 rgba( 230, 0, 0, .2 ); /* #000 */
	box-shadow: 0 0 10px 0 rgba( 0, 0, 0, .2 );
	display: block;
	margin: 0 auto;
	width: 100%;
}

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jagguyAsked:
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Peter HartConnect With a Mentor Commented:
OK, I see , I thought you added that bit of CSS.

I installed a clean wordpress and activated the  theme twenty fourteen on my test site
 then
I went to Appearance->Header
uploaded an image which was way bigger than was needed , but it let me crop it online.
now its resizes when I view it on different devices. (('ve tried it on iPhone and Tablet and PC)
see my test at www.craftstall.com - it resizes simply by changing the size of the browser window

maybe you should try a different size image?  if you re-upload the same image sometimes it doesn't upload.  the theme suggests Images should be at least 1260 pixels wide. Suggested width is 1260 pixels. Suggested height is 240 pixels.

or double check the install and make sure all the files and styles are uploaded.
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Peter HartCommented:
try adding:

height: auto;


also try it out in different Browsers (Ie9, Chrome, Safari)  to make sure its ok
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Peter HartCommented:
of course this won't work if its a background image :-)

If it is a background image - You need to use

background-image:url('../yourheaderimage.png');
background-repeat:no-repeat;
background-size:contain;
background-position:center;
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jagguyAuthor Commented:
The image was placed in the  Appearance> header and I uploaded an image. This is not a background image?
 Also I can resize an image easily enough in a non wordpress website with
width:100%

the height: auto; does nothing.
I have the latest FF and IE.

This must be a common issue but I cant solve it
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Peter HartCommented:
I usually use Chrome or Firefox and inspect the element to see what CSS is active, you may have another img definition overwriting it.
(open the site with Chrone and right click on the image and select 'inspect element' you will be able to see what CSS is in effect and what has been superseded.

what's the URL or the site ?
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jagguyAuthor Commented:
Wait, I am just using twenty fourteen on my local pc. If you go to appearance> headings and upload a picture then what do I do so that the images resizes?

The css tag #headimg   when i change width to 10% the image will be 10% as an example, so this is the right tag

I think people have over thought what I am saying as I just used the defaults but the css tag I have found.  I havent used wordpress  much.
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jagguyAuthor Commented:
ok I am stuck, nothing is resizing the header image
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jagguyAuthor Commented:
ok I reinstalled the theme and itworks now.
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