I design my graph using Highchart. But I can not customize it using CSS and js. Now this time I can't remove the extra grid line from the chart that I have shown in my screenshot. I try to modify d="M 77.5 45 L 77.5 365" from my code, but I can't get it to work. How can I solve this problem! Any help will be appreciated.
Here is a screenshot for clarity: