  We explore features of the scalar structure $X_0(2900)$, which is one of the
two resonances discovered recently by LHCb in the $D^{-}K^{+}$ invariant mass
distribution in the decay $B^{+} \to D^{+}D^{-}K^{+}$. We treat $ X_0(2900)$ as
a hadronic molecule composed of the conventional mesons $ \overline{D}^{* 0} $
and $K^{*0}$ and calculate its mass, coupling and width. The mass and coupling
of $X_0(2900)$ are determined using the QCD two-point sum rule method by taking
into account quark, gluon, and mixing vacuum condensates up to dimension $15$.
The decay of this structure to final state $D^{-}K^{+}$ is investigated in the
context of the light-cone sum rule approach supported by a soft-meson
technique. To this end, we evaluate strong coupling $G$ corresponding to vertex
$X_0D^{-}K^{+}$, which allows us to find width of the decay $X_0(2900) \to
D^{-}K^{+}$. Obtained predictions for the mass of the hadronic molecule
$\overline{D}^{*0 }K^{*0}$ $m=(2868 \pm 198)~\mathrm{MeV} $ and for its width
$\Gamma=(49.6 \pm 9.3)~ \mathrm{MeV}$ can be considered as arguments in favor
of molecule interpretation of $X_0(2900)$.
