Apex New with Apex Serif in action on octoverse.github.com

Under the hood

.header-1 { font-family: 'ApexNew Heavy'; font-size: 28px; font-style: normal; font-weight: bold; letter-spacing: 4px; line-height: 28px; text-transform: uppercase; color: #9DA1C2; }
.header-2 { font-family: 'ApexNew Heavy'; font-size: 38px; font-style: normal; font-weight: bold; letter-spacing: normal; line-height: 38px; text-transform: none; color: #FFFFFF; }
.header-3 { font-family: 'ApexNew Heavy'; font-size: 38px; font-style: normal; font-weight: bold; letter-spacing: normal; line-height: 38px; text-transform: none; color: #FFFFFF; }
.header-4 { font-family: 'ApexSerif Book', serif; font-size: 14px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 21px; text-transform: none; color: #9DA1C2; }
.header-5 { font-family: 'ApexNew Heavy'; font-size: 40px; font-style: normal; font-weight: bold; letter-spacing: 8px; line-height: 40px; text-transform: uppercase; color: #FFFFFF; }
.header-6 { font-family: 'ApexSerif Book', serif; font-size: 14px; font-style: normal; font-weight: normal; letter-spacing: 2px; line-height: 20px; text-transform: uppercase; color: #9DA1C2; }
.header-7 { font-family: 'ApexSerif Book', serif; font-size: 14px; font-style: normal; font-weight: normal; letter-spacing: 2px; line-height: 20px; text-transform: uppercase; color: #9DA1C2; }