ayout (scaling and centering)
        // so that you can use custom CSS layout
        disableLayout: false,

        // Vertical centering of slides
        center: false,

        // Enables touch navigation on devices with touch input
        touch: true,

        // Loop the presentation
        loop: false,

        // Change the presentation direction to be RTL
        rtl: false,

        // see https://revealjs.com/vertical-slides/#navigation-mode
        navigationMode: 'linear',

        // Random