Some layout help please

I am loving sermon speaker so far I am just having a little trouble getting my layout to look the way we want it to.

On this page: crossridgesherwood.com/index.php/podcast

It is a Series?Sermon list - set to accordion.

we have an image that needs to be smaller. I am hoping to do it by adding a line to my css to adjust the width to 40% and tweak the margins. If that makes sense.(we are using a responsive template so can't put in specific widths).

The problem I am running into though is I cannot find the file to edit. I can change things with Google chrome, but there is no file associated with the image css.

Here is what I found for the image:

there are a few things added inline but I get no indication to the file that is being used.

it's not recommended using CSS to reduce image, since file size will be the same size. currently your image is 68kb it's too big for image that size. you can use this site to try and shrink the image down a big in size. tools.dynamicdrive.com/imageoptimizer/ . also you might also want to check here to improve your site load speed gtmetrix.com/reports/crossridgesherwood.com/c2vlFCtg . but if you want to you can resize actual image size here. www.imageoptimizer.net/Pages/Home.aspx

Thank you both for your help!