How can I change an Image in different screen size with swiper? - image

Good evening guys, I wish to change some image in swiper slide when resizing the screen. For example when the breakpoint are more than 1200px, I have some image when I resize the screen in responsive mode, I've another image.
I do this in script js or can I do this from css and html?
Thanks to everyone!

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Code so far:
[Code](https://i.stack.imgur.com/tZASn.png)
So, how would I go about resizing the image so that the text in it is clearly visible. Right now the image is too small in the toolbar. Thank you
fillMode is your issue here, if you comment that out it will not resize to fit in the (small) height of the toolbar

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P.S. I have 10 years of legacy posts with images, so I need a global solution that changes the background to white for all images posted to the blog.
Wrap the image in a div and set the background color of that div with css. That should work
.divclass:active {
background:#FFFFFF
}
If you are opening the images in a new tab or window then your only option is changing the background of the images yourself with a photo editor. If you're just trying to give the user a full size view of an image when they click it you could use javascript/jquery and have a full size div with a background and an image pop up in full screen without sending them to the linked image. Theres probably quite a few jquery plugins that will do this with minimal coding knowledge, just google it.
Thanks, Riley.
I can't go back and edit hundreds of images, so the photo editor option won't work.
But based on your suggestion, I used the following solution:
1) Enabled "Showcase Images with Lightbox" on blogger
2) Added CSS from this page (http://www.howbloggerz.com/2016/05/how-to-customize-blogger-lightbox.html) with no background image and background color set ot white (#ffffff).
Downside is that charts/images now pop up on same page rather than opening in a new tab.
Thank you!

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Demo link (Open in chrome):
When the slides in the banner change, Look at the logo on the top and the logos to the right, and also the profile pics below,: indiaemerge.com/ieys2013
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