  The production of (anti-)deuteron and (anti-)$^{3}$He nuclei in Pb-Pb
collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV has been studied using the ALICE
detector at the LHC. The spectra exhibit a significant hardening with
increasing centrality. Combined blast-wave fits of several particles support
the interpretation that this behavior is caused by an increase of radial flow.
The integrated particle yields are discussed in the context of coalescence and
thermal-statistical model expectations. The particle ratios, $^3$He/d and
$^3$He/p, in Pb-Pb collisions are found to be in agreement with a common
chemical freeze-out temperature of $T_{\rm chem} \approx 156$ MeV. These ratios
do not vary with centrality which is in agreement with the thermal-statistical
model. In a coalescence approach, it excludes models in which nucleus
production is proportional to the particle multiplicity and favors those in
which it is proportional to the particle density instead. In addition, the
observation of 31 anti-tritons in Pb-Pb collisions is reported. For comparison,
the deuteron spectrum in pp collisions at $\sqrt{s} = 7$ TeV is also presented.
While the p/$\pi$ ratio is similar in pp and Pb-Pb collisions, the d/p ratio in
pp collisions is found to be lower by a factor of 2.2 than in Pb-Pb collisions.
