/*.fontyourface p, .fontyourface div {
    font-family: museo, serif;
    font-style: normal;
    font-weight: 100;
}*/

@font-face {
  font-family: "Museo";
  src: url("../../museo300.woff") format("woff");
  font-weight: 300;
  font-style: normal;
  font-display: swap;
}

/* apply to the selector you gave */
.fontyourface p,
.fontyourface div {
  font-family: "Museo", sans-serif;
  font-weight: 300;
  font-style: normal;
}