@Tulpa What's actually messing up on mobile?
Is it a spacing/centering issue?
One problem I see is that you're using spaces to center something. 50 spaces might make something look centered on a screen of a certain size, but it won't be centered on a screen of any other size.
As
@Ellri's link demonstrates, use the [center]...[/center] tags to center things. Center tags are the only way to center something across all devices and screen widths.
Does that solve your problem?