.content {
            margin-left: 2px;
        }
.tasto {
            background-color: #a5cff3 ;
            color: #175c97;
            font-size: 22pt;
            border: none;
            margin: 4px 2px;
            height: 40px;
   width: 46px;
        }
.display {
            background: none;
            color: #175c97;
            font-size: 24pt;
            border: #175c97 solid 2px;
            margin: 4px 2px;
            width: 204px;
            height: 40px;            
        }
.uguale {
            width: 208px;
        }