Avada theme content box troubles

Hello,

i have some problem. My website is not online for the moment.

1) how can i change the size of icon and title in the content box ?

here my code : [content_box title="Hypnose" image="" icon="fa fa-eye" link="" linktext="]

2) how can i center vertically a button on a content box ?

here my code : [content_box title="" top_padding="50%"][button link="" color="custom" size="medium" type="flat" shape="round" target="_self" title="" gradient_colors="#333333|#333333" gradient_hover_colors="#67b7e1|#67b7e1" accent_color="#ffffff" accent_hover_color="#ffffff" bevel_color="" border_width="0px" shadow="no" modal="" animation_type="0" animation_direction="down" animation_speed="0.1" alignment="center" class="" id=""]contact[/button][/content_box]

Please help me.
Thanks