#nero { background-color: #000; position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 100; }
#alertUpdate { color: #fff; font-size: 28px; font-family: arial; font-weight: bold; text-align: center; position: absolute; top: 300px; width: 100%; z-index: 250; }