a {
 display: block;
 margin: 20px;
 width: 380px;
 border: 1px solid black;
 text-decoration: none;
 text-align: center;
 font-size: 200%;
 color: black;
}

img {
 margin: 5px;
 border-style: none;
}

a:hover {
 color: white;
} 

a.familie:hover {
 background-color: black;
}

a.gmbh:hover {
 background-color: #336600;
}