#left {display: none;} 
#top_right {display: none;}
#right {display: none;}
#bottom_left {display: none;}
#bottom {display: none;}
#bottom_right {display: none;}
#controls {display: none;}
#contact_number {display: block;}
#contact {display: block;}
#intro_selection {display:block; }
#intro_selection_texte  {display: none;}
#finition  {display: none;}
#header_print {display: block;}