span.research-and-development::before { content: '1.'; } span.data-center-infrastructure::before { content: '1.1.'; } span.non-volatile-memory::before { content: '1.2.'; } span.energy-efficiency-and-sustainability::before { content: '1.3.'; } span.books::before { content: '1.4.'; } span.patents::before { content: '1.5.'; } span.personal-projects::before { content: '2.'; }