Cover a bowl with the dough with a lid or plastic wrap and leave it for 12 hours at room temperature.
Sprinkle the surface of the table with flour well after 12 hours and put the sticky dough. To keep the dough fluffy, you do not need to knead it but fold it from the edge to the center forming a rectangle.
Put the dough on a baking tray covered with parchment and flour. Cover it with a towel and leave for 1.5 hours.
Place the baking tray with the dough in a preheated oven. Bake it for the first 15 minutes with steam at 220 degrees, and the next 15 minutes without steam at 200 degrees.
Take the ciabatta out of the oven and let it cool down.