.normal {font-weight: normal}
.bold {font-weight: bold}
.bolder {font-weight: bolder}
.lighter {font-weight: lighter}
.a100 {font-weight: 100}
.a200 {font-weight: 200}
.a300 {font-weight: 300}
.a400 {font-weight: 400}
.a500 {font-weight: 500}
.a600 {font-weight: 600}
.a700 {font-weight: 700}
.a800 {font-weight: 800}
.a900 {font-weight: 900}