In this tutorial we will override core theme by creating our own.
By default your landing page should look like this.
For your new theme create following file structure. Yellow are directories already created in Magento, others you have to create manually.
Log in to your admin panel, navigate to design configuration System > Configuration > Design
Now whe you refresh your store main page, it will look like this.
That is because we haven’t created any CSS files in our theme.