Ok, fixed. Found my mistake. I forget to escape % and #
when I copied the code from the .css to try it in .cfg !

This now works in the .cfg.

if anyone is interested. This allows the webpage generated by tex4ht
to have fixed width (which I prefer) but if viewed on mobile and small
screens, it will become flexible width to fit the current size.

------------ add this to your .cfg below \begin{document} section ---

\Css{@media only screen and (min-width: 100px) and (max-width: 960px){
      body{margin-top: 1em;
      margin-bottom: 1em;
      width: auto;
      max-width: 90\%;
      margin-left: auto;
      margin-right: auto; padding: 0em;
      color: \#444;
      font-family: arial, sans-serif;
      line-height: 1.3;
      font-style: normal;
      font-size: 1.0em;
      text-align:justify; background: \#FFFFFF;}}}

\Css{@media only screen and (min-width: 960px){
      body{margin-top: 1em;
      margin-bottom: 1em;
      width: 960px;
      margin-left: auto;
      margin-right: auto; padding: 0em;
      color: \#444;
      font-family: arial, sans-serif;
      line-height: 1.3;
      font-style: normal;
      font-size: 1.0em;
      text-align:justify; background: \#FFFFFF;}}}
-----------------------------------

Now when compiled, the index.css will have this

------------------------ index.css
@media only screen and (min-width: 100px) and (max-width: 960px){ 
body{margin-top: 1em; margin-bottom: 1em; width: auto; max-width: 90%; 
margin-left: auto; margin-right: auto; padding: 0em; color: #444; font-family: 
arial, sans-serif; line-height: 1.3; font-style: normal; font-size: 1.0em; 
text-align:justify; background: #FFFFFF;}}
@media only screen and (min-width: 960px){ body{margin-top: 1em; margin-bottom: 
1em; width: 960px; margin-left: auto; margin-right: auto; padding: 0em; color: 
#444; font-family: arial, sans-serif; line-height: 1.3; font-style: normal; 
font-size: 1.0em; text-align:justify; background: #FFFFFF;}}
------------------------

Case closed.

THanks,
--Nasser

On 8/29/2023 11:46 PM, Nasser M. Abbasi wrote:
Opps, I copied the code with a missing ending extra } at the end.

Here is the correct code in cfg. It still gives same syntax error

------------------------------------------------------
\Css{@media only screen and (min-width: 100px) and (max-width: 960px) {
body{margin-top: 1em; margin-bottom: 1em; width: auto; max-width: 90%;
margin-left: auto; margin-right: auto; padding: 0em; color: #444;
font-family: arial, sans-serif; line-height: 1.5;
font-style: normal; font-size: 1.0em; text-align:justify; background: #FFFFFF;}
}}
---------------------

Runaway argument?
{@media only screen and (min-width: 100px) and (max-width: 960px) { b\ETC.
! Paragraph ended before \Css was complete.
<to be read again>
\par

I tried escaping it using  \@media but that did not work.

Thanks
--Nasser

On 8/29/2023 11:29 PM, Nasser M. Abbasi wrote:

I am trying to add this custom code into my .cfg file, using \Css{...}
that I always used, but it gives syntax error.


The code works fine if I add it manually to the index.css file
after compiling. But I need to put it to my .cfg file so it automatically
go inot each generated .css

The code is below. I got it from this web site

https://www.thatcompany.com/making-fixed-width-website-mobile-friendly

-------------------

@media only screen and (min-width: 100px) and (max-width: 960px) {
body{margin-top: 1em; margin-bottom: 1em;
        width: auto; max-width: 90%; margin-left: auto;
        margin-right: auto; padding: 0em; color: #444;
        font-family: arial, sans-serif; line-height: 1.5;
        font-style: normal; font-size: 1.0em;
        text-align:justify; background: #FFFFFF;}
------------------------

in the .cfg file for tex4ht, I just added \Css{..} to the above giving

-------------------
\Css{@media only screen and (min-width: 100px) and (max-width: 960px) {
body{margin-top: 1em; margin-bottom: 1em;
        width: auto; max-width: 90%; margin-left: auto;
        margin-right: auto; padding: 0em; color: #444;
        font-family: arial, sans-serif; line-height: 1.5;
        font-style: normal; font-size: 1.0em;
        text-align:justify; background: #FFFFFF;}
}
-----------------

But when I compile with make4ht, the error is

Runaway argument?
{@media only screen and (min-width: 100px) and (max-width: 960px) { b\ETC.
! Paragraph ended before \Css was complete.
<to be read again>
\par


Is the problem the use of @ in media?

Thank you,
--Nasser






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