remove gray borders around content

CK Photo,

The gray borders can be removed by changing the following colors to #FFFFFF.

For the gray line underneath the menu:
1. Line 183 in style.css

#page {
    background: none repeat scroll 0 0 #CCCCCC;
    border-radius: 5px 5px 5px 5px;

For the three lines at the bottom of the page:
2. Line 2414 in style.css – Change border-bottom and border-top to #FFFFFF (two of the lines should be fixed by this)

#site-generator {
    background-color: #FFFFFF;
    border-bottom: 2px solid #AAAAAA;
    border-radius: 0 0 5px 5px;
    border-top: 1px solid #CCCCCC;
    clear: both;
    color: #666666;
    display: block;
    font-size: 12px;
    line-height: 2.2em;

3. Line 743 in style.css – Change border-bottom to #FFFFFF

.hentry, .no-results, #author-info, #disqus_thread, #content .error404 {
    background-color: #FFFFFF;
    border-bottom: 2px solid #CCCCCC;
    border-radius: 5px 5px 5px 5px;
    margin: 0 0 2em;
    padding: 0.5em 5% 2em;
    position: relative;
    width: auto;

* The lines numbers could be different, but you should be able to find the relevant code by searching. See if that works.

Hi,
Isn’t it better to make the changes in a child theme?

Can somebody please help me?

I am new to wordpress.org and I am trying to figure out the css.
I would love to remove the borders from the content and sidebars and everything and I keep finding posts about editing css and codes and I just dont know how.

When I go to “edit css” there is nothing there. Only

“/*
Welcome to Custom CSS!

CSS (Cascading Style Sheets) is a kind of code that tells the browser how
to render a web page. You may delete these comments and get started with
your customizations.

By default, your stylesheet will be loaded after the theme stylesheets,
which means that your rules can take precedence and override the theme CSS
rules. Just write here what you want to change, you don’t need to copy all
your theme’s stylesheet content.
*/”

What do I do?