How to find web element using dart

This is my web Element and i need to specifically look for the opacity: 1, try await device.web.findElement(webdriver.By.xpath( "//div[@class='Q88KLb' and style='opacity: 1; transform: scale(1); transition: opacity 300ms cubic-bezier(0, 0, 1, 1) 750ms, transform 1250ms cubic-bezier(0.14, 1, 0.34, 1) 350ms;']"));

but it is not working