Using Sprit-sheet on WordPress categories

I have added some custom category taxonomy and it’s having a field to add icon by the user. i am able display all the categories with icon in the front-end.. but as a part of website optimization if i check with gt matrix it tells to create a sprite-sheet for the icons.

if it was done with html and css i could have done it easily. Each icon is loaded via it’s own url.How do i get rid of this issue in WordPress.

thanks

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