Shopify change text color in checkout

Can someone tell me what im doing wrong? xD Trying to change the text-colors of my Checkout in Shopify.. When i change it in the dev tool in Chrome it works, but in the custom CSS add thing in Shopify it won´t work. So i´ve thought about in the dev tool it´s html and in Shopify its CSS but i´ve done something else the same way and it worked somehow so i thought this would work too lol