html{
      background-image: url(../img/fundo1.jpg);
      background-size: cover;
      background-attachment: fixed;
      background-position: center center;

}
.tela-principal{  
    
    
}

.pagina{
    display: none;
}

@media screen and (max-width:900px){
  #hiddenFix{
        height: 100px;
        width: 100%;      
        top: 100px;
        position: fixed;
        background-image: url(../img/fundo1.jpg);
        background-size: cover;
        background-attachment: fixed;
        background-position: center center;
        z-index: 2
    }
}