SpiderBasic

Does this link https://my9fa7mftn0x.space.minimax.io/ help?

I did little modifications so here is the final version. I added the background handling.

It now uses just Dom ready and resize feature together. Styles will be applied automatically when the page loads.

Note. The timer checks every 100ms until OnsenUI creates the elements, then applies the ...

Forget to mention that this is meant to use with Mobile UI.
Note also that you can have for example both resize and Dom loaded enabled same time.
Put the code at the beginning of your code. Note if you use EnableExplicit it has to be the first line.

Here in one kind of solution to apply some styles to desktop, tablet and mobile.
You are free to test any css.

There is three options to use code: button, resize and Dom already loaded. The end result may be different.
The resize option is on in example but you can change it.

EnableJS

var ...

When you use ShowMobile with list in page it will not work. I think it should?
You can test the code below. Uncomment the two lines to test with most simple list.
SP 3.10

Enumeration
#Dialog
#Open
#Close
EndEnumeration

; Create the dialog
If ContainerMobile(#Dialog, #PB_Mobile_Dialog ...

Did concentrate to IconMobile now.
Obviously this would be the simplest option (the Spiderbasic way) but it do not work:

; Create the icon and store its ID
IconMobile(1, "fa-fighter-jet", #PB_Mobile_Left)
SetMobileAttribute(1, "size", "35px") ; Set the size attribute

Anyway when we use ...

There is actually so little code available using Mobile UI which is a nice library.
So here is one solution to handle basic form and inputs built almost totally using Spiderbasic syntax.
It has also some debug code.

It is created using MiniMax 2.1 almost totally.

EnableExplicit

; Application ...

HtmlMobile is solid solution but I think it will break the layout in three slot containers easily.

But anyway you would think that you could add style to TextMobile (and same problem is with IconMobile) using Spiderbasic syntax because it is available. Thinks gets complicated if you all the time ...

Here is an other option using Icon.

Enumeration
#List
#ImageItem
EndEnumeration

; Create a page
If ContainerMobile(#PB_Any, #PB_Mobile_Page, "margin:12px")

; Create a list
ListMobile(#List)

; Create a custom container within the list
If AddListMobileItem(#List, "", #PB_Mobile_Container ...

This works

ButtonMobile(#title, "Hello World")
SetMobileAttribute(#title, "style", "margin:25px;color:red;") ;
Debug GetMobileAttribute(#title, "style")

This do not work

TextMobile(#title, "Hello World")
SetMobileAttribute(#title, "style", "margin:25px;color:red;") ;
Debug GetMobileAttribute ...