So basically, [this](https://stackoverflow.com/questions/47927414/how-do-i-change-the-height-of-the-tab-indicator-in-material-ui) is what I want to do.

`indicatorClassName` doesn't work for me and the indicator from [codesandbox](https://codesandbox.io/s/7j29kmjwlq) doesn't change at all. I looked through the component's [implementation](https://github.com/mui-org/material-ui/blob/v1-beta/packages/material-ui/src/Tabs/Tabs.js) , and found `indicatorStyle`, but it didn't help neither.

Any ideas?