body{
                background: #fff;
                color: #333;
            }
            
            a, a:visited, a:link, a:active{
                color: #333;
            }
            
            a:hover{
                color: #00f;
            }
        
            .charts_container{
                width: 900px;
                height: 420px;
                margin: 10px auto;
            }
            
            .chart_container_centered{
                text-align: center;
                width: 900px;
                height: 420px;
                margin: 10px auto;
            }
            
            .chart_container{
                width: 400px;
                height: 400px;
                margin: 0px 25px;
                float: left;
            }
            
            .footer{
                font-size: small;
                text-align: right;
            }