Issue number: resolves#27273
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## What is the current behavior?
When breadcrumb is focused in md mode, background is not set.
## What is the new behavior?
A slight background should have applied on breadcrumb when focused.
## Does this introduce a breaking change?
- [ ] Yes
- [x] No
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and migration path for existing applications below. -->
## Other information
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screenshots of how the component looks before and after the change. -->
The Ionic Framework team would like to re-evaluate our approach to improving customization options when building mobile applications. We are looking at other solutions that a) make customizing an app UI easier and b) are applicable to a broader set of developers.
