Museo Sans in action on atap.google.com

Under the hood

.header-1 { font-family: 'Museo Sans Light'; font-size: 40px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 48px; text-transform: none; color: #464646; }
.content-1 { font-family: 'Museo Sans Normal'; font-size: 18px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 26px; text-transform: none; color: #464646; }