Use 'green' electricity
Greenhouse gas emissions
To keep the website running, use electricity that either comes from renewable energy sources, or which has been certified ‘neutral’ by EECS certificates (European Energy Certificate System).
Choose a design that is simple, clear and tailored to the web
Use the features offered by HTML5 and CSS3 to design a website. It is important that you do not attempt to build a website without first taking into account technical constraints.