Stretched class doesn't work with row


i am creating a simple static website for my school with Semantic-UI(which is really awesome). I have run into the issue mentioned in the title while attempting to create a simple side menu layout. I have tried the ‘stretched row’ example that you can in Semantic-UI docs, but it didn’t work too. I am currently using Microsoft Edge as main browser, but i test with alla major ones. I am using the zipped version of Semantic-UI.