Expenses Chart Component using Vue, Chart JS, Pug & SCSS

Hello everyone! It's my first time using Vue and ChartJS. My solution is obviously far from the initial design. So, here's my questions:

• First of all, I didn't quite figure out how to round the borders at the bottom of my each column. When I set it to "borderRadius: 10", ChartJS only rounds the top corners;
• Second, I didn't find any information how to hide separators between columns;
• And lastly, when you hover any column, you are able to see digits without dollar sign.

If anyone knows how to fix these problems, please write down in the comments section.

Thanks in advance!