How to remove the horizontal line in Braintree integration field?

2)  There is a line to the right of the "Total Invoice Amount" text box.  How can I get rid of this?

It's the horizontal line between the amount input and the credit card text. Simply inject the following custom CSS codes to remove that:

#cid_21 > hr {

display: none;

}

You can inject the codes in the Preferences Area or in the CSS area of the Form Designer.