Creating a Child Theme

Hello,

I have a local install of WordPress on my computer and I created a child theme for Twenty Nineteen but my CSS changes are not taking. I tried the same changes and the same setup with Twenty Seventeen and I am able to make CSS changes using the child theme. Do child themes with Twenty Nineteen need to be set up another way?

This is what I have:
/*
Twenty Nineteen Child
Version: 1.0
Template: twentynineteen
*/

@import url(‘../twentynineteen/style.css’);

h1 {
color: green;
}

But my h1’s are not green. Help?