You can change the s tyle of the text on the buttons. Especially if you're site has white text on dark background.

The class of the text in the buttons is "gmnoprint". So just add to your template CSS file: template_css.css:

.gmnoprint div {color: #000000;}

For  the infowindow you can place a div in the text parameter like:

{mosmap text=<div style=color:#000000;>text</div>}

Another solution is to place in the article around the {'mosmap}:

<div style=color:#000000;>{'mosmap}/<div>

It's possible to change the background and border of the buttons. Add for example this to your template css:

#amtc_option_0, #amtc_option_1, #amtc_option_2, #amtc_option_3 {
border: 3px solid #F00 !important;
background-color: #000 !important;
}

and you'll get a black background and red border. Also you have to change the textcolor to white!

Check with something like firebug that the names of the classes are correct.