prova

.alertbar { 
    background-color: #ff0000; 
    color: #FFFFFF; 
    display: block; 
    line-height: 45px;
    height: 50px; 
    position: relative; 
    text-align: center; 
    text-decoration: none; 
    top: 0px; 
    width: 100%;
    z-index: 100;
}

.alertbar { 
    background-color: #ff0000; 
    color: #FFFFFF; 
    display: block; 
    line-height: 45px;
    height: 50px; 
    position: relative; 
    text-align: center; 
    text-decoration: none; 
    top: 0px; 
    width: 100%;
    z-index: 100;
}