I want to add a subheading to my site title that states "A Division of Francis NY Plastic Surgery"

<script>
a#site-title:after {
    content: "A Division of Francis NY Plastic Surgery";
    display: block;
    font-size: 20px;
    color: green;
    font-family: monospace;
}
</script>

this is what i have for code but it's not working

19 hours ago, Joekelly44 said:

<script>
a#site-title:after {
    content: "A Division of Francis NY Plastic Surgery";
    display: block;
    font-size: 20px;
    color: green;
    font-family: monospace;
}
</script>

 

this is what i have for code but it's not working

You have mistake on the code. Here is the right code. Please replace the code with the code below. Also if you share your website URL then it will be easer to check. 

<style>
  a#site-title:after {
    content: "A Division of Francis NY Plastic Surgery";
    display: block;
    font-size: 20px;
    color: green;
    font-family: monospace;
  }
</style>