a.red img {
background-image:url("/buttons_svg_png/red.png");
}

a.orange img {
background-image:url("/buttons_svg_png/orange.png");
}

a.yellow img {
background-image:url("/buttons_svg_png/yellow.png");
}

a.green img {
background-image:url("/buttons_svg_png/green.png");
}

a.blue img {
background-image:url("/buttons_svg_png/blue.png");
}

a.indigo img {
background-image:url("/buttons_svg_png/indigo--.png");
}

a.violet img {
background-image:url("/buttons_svg_png/violet.png");
}