How to change SVG color with CSS?

Question

css

There is such an animated checkmark made in SVG and CSS:
https://jsfiddle.net/sqey1dth/
We need to change the green color to blue.
I'm trying to change the color through CSS, but the color does not change.
Help to understand please.

Answer 1

.checkmark__circle {
  stroke: ЦВЕТ;
}

@keyframes fill {
  100% {
    box-shadow: inset 0px 0px 0px 30px ЦВЕТ;
  }
}