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Issue number: N/A
---------
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issue. -->
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etc). Submit multiple pull requests if needed. -->
## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->
The Angular implementation of `ion-tabs` uses SASS styles in the inline
usage for styles:
```ts
styles: [`
:host {
z-index: $z-index-page-container;
}
`]
```
However Angular is expecting CSS mark-up by default. This results in an
invalid value being assigned to the `z-index`.

## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->
- Removes the invalid style from the tabs stylesheet
- Removes unnecessary leading whitespace from the template
## Does this introduce a breaking change?
- [ ] Yes
- [x] No
<!-- If this introduces a breaking change, please describe the impact
and migration path for existing applications below. -->
## Other information
<!-- Any other information that is important to this PR such as
screenshots of how the component looks before and after the change. -->