Changing colour of SVG icon

Hello,

On this page: https://susanbensen.com/faqs/ I'm trying to change the colour of the question marks.

I can't get the selector correct, I tried this without success:

.mk-toggle-title svg .mk-svg-icon .mk-icon-question {
fill: rgba(66, 108, 171, 1)) !important;
}

Thanks in advance,
Casper