How can I add this css code to my project?

I know there is an easy way to do this but I can't figure it out. I want to change the default highlight color of text selection and this is the css code,. How can I add it to my edge animate site?

Highlight Code:

::-moz-selection {

background-color: #BA9EB0;

color: #ffffff;

}

::selection {

background-color: #BA9EB0;

color: #ffffff;

}