body{
    max-width:100%;margin:auto
}
#area-site{
    max-width:970px;
    margin:auto;
    padding-top: 50px!important;
}
.area-principal,
.colunas-internas{
    flex-direction: column!important;
}
.coluna-esquerda{
    max-width: 100%!important;
}
.coluna-direita{
    width: 100%!important;
}