Recommended: Understanding the Blogger New Template HTML Editor and its Features
Step 2 Click on Now click on -> Template -> Edit HTML
Step 5 Now after </head> to end of the template you will find HTML code. Usually code start with <body> to </body> tag. we can expand the code by clicking of black arrow that placed on line numbering.
Step 6 After necessary editing of the code you can exit by clicking on Save Template button.
Write CSS code inside this conditional tag.