I would like to change the background color of only the actual post ( from dark to light )

Hi everybody. I have been working on changing the color of the actual post in my forum but nothing else. FOR EXAMPLE: My forum is mostly back, silver and grey. However I would like the people who are reading a post to see it with a white background as it is easier to read. Is it possible to only change the color of this area without changing all other colors? Like this forum has a light blue background behind what you are reading right now. I would like mine white.

Thank you for your help.

Figured it out finally lol. For others looking to change the background described in this post, it is here in the css are

.post {
background-color: #181818;
border-bottom: 10px solid #666666;
}
.post-container {
background-color: #F3F4EC;
}
.post-footer {
background-color: #181818;
border-top: 1px solid #000308;
}
.post .post-header {
background-color: #181818;
}
.popmenubutton-new-out a {
background-color: #181818;
}
.topic-footer {
background-color: #000;