CSS to change hyperlink colour on one page

I'm working on a WordPress site with the Twenty Twenty theme and have made some CSS changes which apply globally to make all hyperlinks red as below:

a {
  color:#ff0000;
}

I used the CSS customise side bar to globally change hyperlink colour to red but now I need to change the hyperlink colour to white for all 'list' links on just one page, leaving all other pages with red links (don't ask, it's a requirement of someone).

I have tried the CSS edits below and none seem to work for my page. The hyperlinks are WordPress list items if it helps at all. As you can probably tell I don't understand CSS enough to isolate one page to it's own styling.

.page-id-253:li{
  color:#FFFFFF;
}

.page-id-253:ul{
  color:#FFFFFF;
}

#page-id-253:link{
  color:#FFFFFF;
}

#page-id-253:a{
  color:#FFFFFF;
}

How do I select the links in list items on just one page of my WordPress site?

You are using the wrong syntax.

And there is actually a :not selector in css where let you give style to the other element exclude the specific element.

a{
color:red;
}  

/*a:not(#page-id-253 a){
color:red

}*/

.menuitem li a {
color:black

}

<a >Click</a>
<ul class='menuitem'>
<li><a>Link </a></li>
</ul>