add new class in style.css for each field:
.input_y {
font-family: Tahoma,Verdana,Arial,Helvetica,sans-serif;
color: #0f5475;
font-size: 11px;
width: 50px;
}
.input_m {
font-family: Tahoma,Verdana,Arial,Helvetica,sans-serif;
color: #0f5475;
font-size: 11px;
width: 130px;
}
.input_d {
font-family: Tahoma,Verdana,Arial,Helvetica,sans-serif;
color: #0f5475;
font-size: 11px;
width: 50px;
}