Hi,
Just add the css code for the paypal payment option. Change the code around line 7350 to:
p.payment_module a.cheque:after, p.payment_module a.bankwire:after, p.payment_module a.cash:after, p.payment_module a#paypal_process_payment:after {
display: block;
content: "\f054";
position: absolute;
right: 15px;
margin-top: -11px;
top: 50%;
font-family: "FontAwesome";
font-size: 25px;
height: 22px;
width: 14px;
color: #777777; }
See the 'p.payment_module a#paypal_process_payment:after' this generates the arrow:)
Add this code in your css to get the white background:
p.payment_module a#paypal_process_payment { background: #fbfbfb;}
Hope this helps.