put a gloss on something idiom
（尤指出于私心而）突出…的好处，夸饰…好的一面，粉饰
to emphasize the good parts of something that has been done, especially those that are to your advantage, and to avoid the bad parts
Politics is all about putting a good gloss on unpleasant or difficult situations. 政治无非就是用粉饰太平的手段来掩饰令人不快或困难的局面。