These instructions were made for sites that originally created a template set by making a full copy of the default template set1), instead of using the Create Main Template Set tool within the admin at Design > Template Sets. If you used that tool to create your template set, then you should not need to follow these instructions2), as they were already done for you by the tool.
Again, I want to make it clear that these instructions are not normally needed, as they re-produce something that the software would normally do for you. They are only needed when the steps the software does for you are somehow accidentally bypassed.
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/* $Rev:12345$ */
The number will be different. If it DOES have that line at the top, then replace the line with the below, filling in the "Rev number" in your file for # below:
@import url('../../../default/external/css/theme_styles.css'); /* * Leave first line of this file intact to make software updates easier! * * File manually copied using Rev: # */
<tip c h>Note: The most important part of what you are adding to the theme_styles.css file, is the first line, the one that starts with "@import…". The lines below that are "CSS Comments", they do not have any affect on the actual "styles" of your website, they are there for information purposes9).</tip> <
@import url('../../../default/external/css/primary_theme_styles.css'); /* * Leave first line of this file intact to make software updates easier! * * File manually copied using Rev: # */
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@import url('../../../default/external/css/secondary_theme_styles.css'); /* * Leave first line of this file intact to make software updates easier! * * File manually copied using Rev: # */
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<