Order summary - Webpack

Nice done @NicolasMontoya; here are my comments:

• Try to avoid universal selector, no matter if it's used inside an ancestor element in your rule, check on some notes in the section "is inefficient in terms of performance" here.
• There is a visual a11y; if a user navigates the component using the tab key, notice that the Proceed payment and Cancel order elements don't have a focus state.