/* copy paste it in your .css file*/
@import url("https://fonts.googleapis.com/css2?family=Open+Sans:wght@300;400;600;700;800&display=swap");
/* copy paste it in your .html or .php file*/
<link href="https://fonts.googleapis.com/css2?family=Open+Sans:wght@300;400;600;700;800&display=swap" rel="stylesheet" type="text/css">