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Instead of displaying full price format you can display sale price or regular price. please see the screenshot how to do that.
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you can try following css
display: block; /*to display separate line*/
Try using !important; to override css
i want to display full price, but with adjustments of the sale price to make him bigger and red, and for the regular price to stay gray and small. and i want to do a <br> between them so the old price could be on top of the sale's price
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