Ключевые слова: app, application, bar, black, chart, class, clip art, clipart, column, concept, dark, data, design, diagram, e learning, education, element, filled, flat, glyph, graph, icon, illustration, interface, isolated, learning, math, mobile, negative space, option, phone, pictogram, report, school, sign, silhouette, simple, software, statistics, symbol, ui, user interface, ux, vertical, web, white,