Source Sans in action on typ.io

Under the hood

.content-1 { font-family: source-sans-pro, -apple-system, BlinkMacSystemFont, "segoe ui", roboto, oxygen, ubuntu, cantarell, "fira sans", "droid sans", "helvetica neue", helvetica, arial, sans-serif; font-size: 16px; font-style: normal; font-weight: 400; letter-spacing: normal; line-height: 28px; text-transform: none; color: #222222; }
.content-2 { font-family: source-sans-pro, -apple-system, BlinkMacSystemFont, "segoe ui", roboto, oxygen, ubuntu, cantarell, "fira sans", "droid sans", "helvetica neue", helvetica, arial, sans-serif; font-size: 16px; font-style: normal; font-weight: 400; letter-spacing: normal; line-height: 28px; text-transform: none; color: #222222; }
.content-3 { font-family: source-sans-pro, -apple-system, BlinkMacSystemFont, "segoe ui", roboto, oxygen, ubuntu, cantarell, "fira sans", "droid sans", "helvetica neue", helvetica, arial, sans-serif; font-size: 16px; font-style: normal; font-weight: 400; letter-spacing: normal; line-height: 28px; text-transform: none; color: #222222; }