Promotion Headline Button Text Colour & Background

Hi, 1) I have made my Promotion Headline Button Text to call a number. However I would also like to change the colour of the text and the background of the button. Please help. 2) I would like to change the font and its colours of the fonts in the theme across if possible, or wherever I can? 3) On my front page, I have numbered few points. The number do not take the colour from the text 4) I would like to maitain the same colour for the page heading as well. Please Help! Thanks.