Adding CSS to limit width of images uploaded via Comment Images plugin

Closed - This job posting has been filled and work has been completed.

Job Description

My site is avelim.co.il. The site is on Hebrew wordpress 3.7.1, using the theme Weaver II Pro 2.1.1
The site has 146 active plugins.

My test site is avelim.org.il

What I need?
I am using the plugin Comment Images
http://wordpress.org/plugins/comment-images/
Comment Images gives readers the ability to upload an image to their comment right from the comment form

What I want - currently the is no limit to the with of the image displayed, for images uploaded via the plugin

See for example
http://goo.gl/A8vYoS

What I want - I want that images wider then a set size - 600 pix, will be re sized so that they will be in 600 pix width, without changing image proportions.

How I want this done? Freelancer shall send me CSS to add to Jetpack's CSS editor, to achieve the requested result.

Freelancer shall not have access to my sites.

I saw a discussion on this on the support site of the plugin. I could not implement the suggested solution. Maybe freelancer will find it useful
http://wordpress.org/support/topic/plugin-comment-images-size-limit

Work should be done in 24 hours after being awarded the project.

Freelancer should allow 7 days for testing after he finishes his work, before getting paid.

Work should stand WordPress and theme upgrades