#98. Cards: gray
Make every `.item` box **100px** wide, with a **gray** background and **10px** round corners. `.row` is a flex box with a **10px** gap.
Checklist
- ○ display: flex
- ○ gap 10px
- ○ Every box is 100px
- ○ Background gray
- ○ Corners 10px
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