Trouble changing default font on pages

Site URL: https://www.caroline-shenaz-hossein.com/portal-main

Hello,

I have a few pages that i need to look different than the other pages, and part of that is the font. I've managed to change the colour of h1, h2, h3 etc, but not the font.

Here's the section of code that i've put in the header. (I can provide all the code if it's relevant). It doesn't seem to matter where I put !important

#collection-62702969fd68866477d96224
h1 { 
  color: #800032;!important;
  font-family: "Times New Roman", Times, serif;!important;
}

  h2 {
  color: red;!important;
    font-family: "Times New Roman", Times, serif;!important;
  }
  
  h3 {
    color: blue;!important;
    font-family: "Times New Roman", Times, serif;!important;
}
  
  p {
    color: black !important;
  font-family: "Times New Roman", Times, serif;!important;
}
  
a {
    color: blue !important;
  font-family: "Times New Roman", Times, serif;!important;
}
  .sqs-block-horizontalrule hr { background-color: blue; 
  }
  

Thanks so much!