This "viewer" frame opposite should enable viewing of the Vine on tablets and smartphones.
Clicking the grey translucent circle in the image of the cover will bring up a full-screen view, At the top is a magnifying-glass icon. Clicking this will bring up a slider bar which will enable you to magnify the pages. There are left and right arrows to navigate through the pages, or you can use the slider at the foot of the screen. You can also click-and-drag to pan the pages around.To go back to the main website, click the X at top right or press Esc on your keyboard.