Hey there! I need a bit of help with a login page

Hey there! I’m facing an issue with a login page that I am making.
My element .submit-btn has a border. However this border is being passed down to its child .btn. How may I stop this from occurring? Your can find my codepen here (Or at https://codepen.io/reubenmenezes1/pen/porgyoQ if you prefer to not click random hyperlinks).
Any criticism is welcome.

Problem solved , my button element had the same class as my div that was its parent