Change link to stylesheet

README.rst

@@ -216,7 +216,7 @@ This requires you to configure the relationship `ext_robotframeworklog` in your
 Color Test Results
 ==================
 
-Use the [stylesheet](doc/source/_static/xunit2rst.css) get a background color for the test results (pass, fail and skip)
+Use the stylesheet_ get a background color for the test results (pass, fail and skip)
 in the generated HTML documentation of the test case.
 This feature is used in the `test reports`_.
 
@@ -225,3 +225,4 @@ manually in you own stylesheet.
 
 .. _test reports: https://melexis.github.io/xunit2rst/generated/itest_report.html#test-reports
 .. _add_css_file: https://www.sphinx-doc.org/en/master/extdev/appapi.html#sphinx.application.Sphinx.add_css_file
+.. _stylesheet: doc/source/_static/xunit2rst.css