.cab_web {
    position:absolute;
    background-image:url('../images/cab_web.jpg');
    width:545px;
    height:148px;
}
.msg_erro {
    padding: 5px; 
    background-color: Red; 
    border: 1px solid Orange; 
    color: #FFFFFF;font-family:Arial;font-size:12px;
}
.msg_sucesso {
    padding: 5px; 
    background-color: Green; 
    border: 1px solid YellowGreen; 
    color: #FFFFFF;font-family:Arial;font-size:12px;
}