body{font-family: 'Roboto', sans-serif;background-color: #fff;}

.font_roboto_100{font-family: 'Roboto', sans-serif;font-weight: 100}
.font_roboto_300{font-family: 'Roboto', sans-serif;font-weight: 300}
.font_roboto_400{font-family: 'Roboto', sans-serif;font-weight: 400}
.font_roboto_500{font-family: 'Roboto', sans-serif;font-weight: 500}
.font_roboto_700{font-family: 'Roboto', sans-serif;font-weight: 700}
.font_roboto_900{font-family: 'Roboto', sans-serif;font-weight: 900}