GT Sectra Fine, IBM Plex Mono with Jigsaw Sans in action on jigsaw.google.com

Under the hood

.header-1 { font-family: "GT Sectra Fine", sans-serif; font-size: 100px; font-style: normal; font-weight: 350; letter-spacing: normal; line-height: 100px; text-transform: none; color: #121112; }
.header-2 { font-family: "IBM Plex Mono", sans-serif; font-size: 14px; font-style: normal; font-weight: 500; letter-spacing: 2px; line-height: 18px; text-transform: uppercase; color: #121112; }
.content-1 { font-family: "IBM Plex Mono", sans-serif; font-size: 14px; font-style: italic; font-weight: 500; letter-spacing: 2px; line-height: 18px; text-transform: uppercase; color: #121112; }
.content-2 { font-family: "Jigsaw Sans", sans-serif; font-size: 18px; font-style: normal; font-weight: 400; letter-spacing: 0px; line-height: 26px; text-transform: none; color: #121112; }