[Tab] Last tab should still have a bottom margin

[ramaboo-deliv]

Go to: https://semantic-ui.com/modules/tab.html#/examples

Find the tab labeled 2B and 2C and switch between them a few times. Notice how the last tab does not have a bottom margin.

Has a bottom margin:

Does not have a bottom margin:

Something like this needs to be in the code:

.ui.tab.segment:last-child {
  margin-bottom: 1rem;
}

to override the generic .ui.segment:last-child stuff.