Client

Entice Energy is a startup that aims to supply energy (starting with gas) to domestic household across the UK.

So, the height and width is not fixed, and it is calculated dynamically according to the diminutions of the window. Under that div, there is another one that has the ID header "navigation bar", the header is initially positioned relatively under div.fullscreen - however, I am trying to position it as Fixed when the top of the #header reaches the top of the browser window. So here is what I am playing around, it toggles the Fixed style, but it does not toggle it at the right place...

Concept

Entice Energy is a startup that aims to supply energy (starting with gas) to domestic household across the UK.

Services

Entice Energy is a startup that aims to supply energy (starting with gas) to domestic household across the UK.

Result

Entice Energy is a startup that aims to supply energy (starting with gas) to domestic household across the UK.