Proxima Nova in action on landerapp.com

Under the hood

.header-1 { font-family: proxima-nova, sans-serif; font-size: 28px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 39px; text-transform: none; color: #FFFFFF; }
.header-2 { font-family: proxima-nova, sans-serif; font-size: 86px; font-style: normal; font-weight: 600; letter-spacing: -4px; line-height: 69px; text-transform: uppercase; color: #FFFFFF; }
.header-3 { font-family: proxima-nova, sans-serif; font-size: 21px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 30px; text-transform: none; color: #333333; }
.header-4 { font-family: proxima-nova, sans-serif; font-size: 15px; font-style: italic; font-weight: 300; letter-spacing: normal; line-height: 48px; text-transform: none; color: #FFFFFF; }