Это layout flex с: двумя aside и контейнером flex содержащим (header+section+section+footer)
section sectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsectionsection