I guess font-family should come from `uikit` variables instead. https://github.com/gravity-ui/chartkit/blob/0a4c3c04a6e861932054f3bcef59b9a6858f8d8d/src/plugins/highcharts/renderer/helpers/tooltip/tooltip.scss#L5 https://github.com/gravity-ui/chartkit/blob/0a4c3c04a6e861932054f3bcef59b9a6858f8d8d/src/plugins/yagr/renderer/tooltip/tooltip.scss#L2
