Changing the font from Bootstrap CDN


I use ckeditor on one of my websites.
I defined bootstrap css in the config file.
However, the font has changed in the last update. How can I change it to Arial?

config.contentsCss = ['', ''];

I installed the “Helvetica Neue” font on the computer to get the text width in pixels using PHP, which turned out to be the default font of my website and ckeditor.
So, I guess the next font is shown when the “Helvetica Neue” font is not installed on the computer.

Can the “Helvetica Neue” font be ignored by adding anything to the CDN url?

I added the following to the head tag for the site, but I don’t know if something like this can be added for ckeditor.

      body {
        font-family: Arial !important;

Font convention in URL:

body {
	font-family: "Helvetica Neue",Helvetica,Arial,sans-serif;
	font-size: 14px;
	line-height: 1.42857143;
	color: #333;
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