How to code a button in template Rally with colour #fa840f

Site URL: https://www.madmentoruddannelsen.dk/fllesskabet

Hi everyone, 

I need help with my signup box, that I embeed from Simplero.
I need help to code the button in the same colour as the other buttons at this template. The colour is hsl(25, 100%, 52%). I guess it is #fa840f.
And the text too which is: Brandon Grotesque. https://simplero.com/

Thanks Guys

All the best

Marie 

You mean: ja, jeg...button?

Add to Design > Custom CSS

div#block-yui_3_17_2_1_1555965676640_5994 input[type="submit"] {
    color: hsl(25, 100%, 52%);
    font-family: Brandon Grotesque;
}