Help needed with Custom Footer code

First topic message reminder :

Hi guys

I'm trying to make a custom footer for my Invision forum, after reading of these topics here:
https://help.forumotion.com/t143469-adding-footer-to-the-forum
https://help.forumotion.com/t143945-footer-template

I've obtained a free html template on the internet, edited the code so the footer rests in a DIV element.. But when I tried to put it at the bodem in the overall_footer_begin template the footer displays correctly but it pushes the forumparts upwards overlapping my header and gives some parts of the left widgets a blue background color. I have no clue what is causing this, I have little coding experience so it's all a riddle to me..

This is what happens:

This is how the footer should look:

This is the code I used:

Any ideas on how to fix this are very welcome
Testforum: http://punt.forumactie.com/

Glad I could help!