Hello, I need help styling my javascript error messages in strictly javascript. My professor does not want me to mix HTML in my js code. How can I style my error messages with strictly javascript?

heres my current code that is breaking the division of concerns by using html in my js code:

JAVASCRIPT CODE:

if (title === "") { errorMessage += "

Title field cannot be empty.

"; }

CSS CODE:

.error-message { color: red; }

thank you!