I am writing the official interface to make a project on Rmarkdown

[saad_saad]

---
title: <span style="color:cryan"> "**examen**"
author: <span style="color:red"> "**SAAD SAADOUNI**"
  date: "2022-11-29"
output: 
    html_document:
      them: cerulean
       df_print: paged
        highlight: tango
         number_sections: yes
          toc: yes
           toc_float: yes
editor_options: 
     chunck_output_type: inline
    
---
Error in yaml::yaml.load(..., eval.expr = TRUE) : 
  Scanner error: mapping values are not allowed in this context at line 3, column 7
Calls: <Anonymous> ... parse_yaml_front_matter -> yaml_load -> <Anonymous>
Execution halted

[FactOREO]

You wrote "them" instead of "theme" is the first which comes to mind. Also, there is no indentation in your code snippet.