images displaying in a site is not looking responsive

we are using follwing code to display images in this site:

http://ift.tt/1DIYxEV

<img src="{{media url="wysiwyg/topoffers.jpg"}}" alt="" /> 

you can see 4 images below "slideshow" images..... but it's not looking responsive ....

means in mobiles and tabs it's not arranged properly

means in smaller screen monitors , it's not displaying properly....

please help me what code changes i have to do to make it responsive

thanks in advance....