IBM Plex Mono with IBM Plex Sans in action on embacy.io

Under the hood

.header-1 { font-family: "IBM Plex Sans", sans-serif; font-size: 46px; font-style: normal; font-weight: 400; letter-spacing: normal; line-height: 60px; text-transform: none; color: #111111; }
.content-1 { font-family: "IBM Plex Sans", sans-serif; font-size: 13px; font-style: normal; font-weight: 700; letter-spacing: 0px; line-height: 38px; text-transform: uppercase; color: #FF4A47; }
.content-2 { font-family: "IBM Plex Mono", sans-serif; font-size: 21px; font-style: normal; font-weight: 400; letter-spacing: 0px; line-height: 45px; text-transform: none; color: #4A4D52; }