a.A3{
background-image:url(../img/3_umbauten/3A.png);
display: block;
width: 297px;
height: 600px;
}
a.A3:hover {
background-image:url(../img/3_umbauten/3A_Text.png);
}

a.B3 {
background-image:url(../img/3_umbauten/3B.png);
display: block;
width: 297px;
height: 297px;
}
a.B3:hover {
background-image:url(../img/3_umbauten/3B_Text.png);
}

a.C3 {
background-image:url(../img/3_umbauten/3C.png);
display: block;
width: 297px;
height: 297px;
}
a.C3:hover {
background-image:url(../img/3_umbauten/3C_Text.png);
}

a.E3 {
background-image:url(../img/3_umbauten/3E.png);
display: block;
width: 600px;
height: 297px;
}
a.E3:hover {
background-image:url(../img/3_umbauten/3E_Text.png);
}