  });
            usernameInput.addEventListener('focus', () => {
                focusInput = true;
                setBlendTracks();
            });
            usernameInput.addEventListener('blur', () => {
                focusInput = false;
                setBlendTracks();
            });

            // Animation left/down blending
            const ALPHA_LEFT_RANGE = 4;
            const ALPHA_DOWN = .8;
            const ALPHA_DOWN_RANGE = 2;
            const moveVector = [0, 0];
            const