.header{background-color: #008cba;color:#428bca;padding-top: 2%;padding-bottom: 2%;text-align:center;font-size:150%}
.spazio{margin-top:5%}
.navbar-collapse{/*width:33.33% !important;margin:auto !important;*/font-size:120%}
body {
  
  padding-top: 70px;
}
#back_to_top {
	text-align:center;
    position: fixed;
    bottom: 15px;
    right: 15px;
    cursor: pointer;
    z-index:2;
    
}
.contenitore{
	min-height:350px;
}