See that X i circled. Please use that to make a red version of the check circle. And then please modify the check circle to be same diamter (circle size) of the x I know the x is bigger by 1px and cant fit centered in the original circle.
Here's the check gif:
http://www.neocodex....silk/accept.png
here's a +/- one which might help you out:
http://www.neocodex....es/silk/add.png
http://www.neocodex....silk/delete.png
Thanks!