Basic CSS code format

Please convert the following code to the proper format to drop in the CSS code box (seeking to change the 50px to 10px).
I have tried using the code as is, changing the px size but it did not change the top or bottom padding.
Thanks in advance for your help.
Rickster

Below code seems to be from “layout.css?ver=2:1405

.content, .sidebar {
padding-top: 50px;
padding-bottom: 50px;
-webkit-box-sizing: content-box;
-moz-box-sizing: content-box;
box-sizing: content-box;
min-height: 1px;
z-index: 1;
}