  Let $\mathcal{A}$ be the class of analytic functions $f$ in the unit disk
$\mathbb{D}=\{z\in\mathbb{C}:|z|<1\}$ with the normalized conditions $f(0)=0$,
$f'(0)=1$. For $-\pi/2<\alpha<\pi/2$ and $0\le \beta<1$, let
$\mathcal{S}_{\alpha}(\beta)$ be the subclass of $\mathcal{A}$ consisting of
functions $f$ that satisfy the relation $${\rm Re\,}
\left\{e^{i\alpha}\left(1+\frac{zf''(z)}{f'(z)}\right)\right\}>\beta\cos{\alpha}\quad\text{for}~z\in\mathbb{D}.$$
In the present study, we will compute the sharp estimate of the pre-Schwarzian
and Schwarzian norms for functions in $\mathcal{S}_{\alpha}(\beta)$.
