Untitled Sans with Untitled Serif in action on montecarlodata.com

Under the hood

.header-1 { font-family: UntitledSerif, sans-serif; font-size: 34px; font-style: normal; font-weight: 500; letter-spacing: normal; line-height: 42px; text-transform: none; color: #04101C; }
.content-1 { font-family: UntitledSans, sans-serif; font-size: 19px; font-style: normal; font-weight: 400; letter-spacing: normal; line-height: 34px; text-transform: none; color: #04101C; }
.content-2 { font-family: UntitledSans, sans-serif; font-size: 18px; font-style: italic; font-weight: 400; letter-spacing: normal; line-height: 30px; text-transform: none; color: #04101C; }
.content-3 { font-family: UntitledSans, sans-serif; font-size: 18px; font-style: normal; font-weight: 400; letter-spacing: normal; line-height: 30px; text-transform: none; color: #04101C; }