saleor-dashboard/src/components/Tab/TabContainer.tsx

import {
  createStyles,
  Theme,
  withStyles,
  WithStyles
} from "@material-ui/core/styles";
import React from "react";

export interface TabContainerProps {
  children: React.ReactNode | React.ReactNodeArray;
}

const styles = theme =>
  createStyles({
    root: {
      borderBottom: `1px solid ${theme.overrides.MuiCard.root.borderColor}`
    }
  });

const TabContainer = withStyles(styles, {
  name: "TabContainer"
})(({ classes, children }: TabContainerProps & WithStyles<typeof styles>) => (
  <div className={classes.root}>{children}</div>
));
TabContainer.displayName = "TabContainer";

export default TabContainer;