/* The 6th Grade Social Studies page: four chapters, laid out like the Science page. */
.chapter.c1{background:#E3EEFF}.chapter.c1 .lab nav.tabs{background:#E3EEFF}
.chapter.c2{background:#FFE1DD}.chapter.c2 .lab nav.tabs{background:#FFE1DD}
.chapter.c3{background:#FFEBC9}.chapter.c3 .lab nav.tabs{background:#FFEBC9}
.chapter.c4{background:#D8F3EE}.chapter.c4 .lab nav.tabs{background:#D8F3EE}