Following Sidebar

Hi everyone!

I'm trying to make the Sidebar and Message Sidebar follow to the end of the page/message

I'm currently using this code in the global CSS but is not doing anything:

@include screen-lg {
    .sidebar {
        align-self: flex-start;
        position: sticky;
        top: 50px;
    }
.messageSidebar {
    align-self: flex-start;
    position: sticky;
    top: 50px;
    }
}

Can anyone tell me why?

Quote from Black Rider

Crossposting without a notice is not very nice.

I apologise about that, I didn't know it was a thing.