span.sample1 {font-weight: normal; }
span.sample2 {font-weight: bold; }
span.sample3 {font-weight: lighter; }
span.sample4 {font-weight: bolder; }
span.sample100 {font-weight: 100; }
span.sample200 {font-weight: 200; }
span.sample300 {font-weight: 300; }
span.sample400 {font-weight: 400; }
span.sample500 {font-weight: 500; }
span.sample600 {font-weight: 600; }
span.sample700 {font-weight: 700; }
span.sample800 {font-weight: 800; }
span.sample900 {font-weight: 900; }