Visualize Data with a Bar Chart help with setting width and styling on bars

Tell us what’s happening:
Hi can someone help out with setting the width on my bars, you can see on my codepen that it is over running my x-axis. I am a little confused on how to calculate the bars correctly. All my test are fine currently, but I am having trouble with the equation for styling.

Also how do you get the borders, maybe margins on the bar lines, so you can see some separation?

Your code so far
https://codepen.io/raregamer/pen/oNvQKep

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/data-visualization/data-visualization-projects/visualize-data-with-a-bar-chart