I need a small responsive landing page for my website, to look good on all screen sizes (desktop, laptop, mobile), maybe made in Flutter or React.js. I want my logo at the top, in the center, my twitter handle underneath that, a video underneath that (to autoplay when the page loads in browser, with a loading spinner while the video loads). Below the video, I want 1 line of text with 5 words. Below the line of text I need two buttons, "Learn more..." and "Sign in" and below the buttons I want an Instagram icon and Facebook icon. At the bottom of the screen, in the center, I want the Apple App Store Download icon.