Sizing of footer and/or width

Hi,
Below are the questions i have, which would be very helpful to me if resolved.

1) How do i change the font size of the footer. I used a css to change the size of the “paragraph” when writing description of product. But that also changed the footer size.

2) When a product is selected, and i select the option for a size/qty, the actual price value is relatively small. Is there a way to control that and make it either bigger or different color to distinguish the value.

3) the social icons when using a widget for my site dont display. Only facebook displays on the footer.

4) I created a button using the Visucal composer. But oddly, it does not allow me to display this button in the center of the home page.

Please advise.

Thanks.