How to add a white background to blog content

to add a white background to your posts:

.content-area{
background-color: rgb(255,255,255);
}

To keep this background out of your home page:

.home .content-area{
background-color: rgba(255,255,255,0);
}

Hi – please forgive my ignorance, but is this code to be edited into the stylesheet for the theme?

Good grief that was fast! 🙂

Thank you very much, Andrew!