Dielectron $m_{\rm ee}$-differential yields in semi-peripheral (50--70\%) and peripheral (70--90\%) Pb--Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV, compared with the expected e$^{+}$e$^{-}$ contributions from known hadronic decays. The error bars and boxes represent the statistical and systematic uncertainties of the data, respectively, whereas the bands show the uncertainties of the hadronic cocktail. Arrows indicate upper limits at 90\% confidence level.