Theme is broken!

Hello! Theme is broken. In different browsers there is different issues.
My web page link: https://e-cigaretteuk.org.uk/
So in chrome broken is post box. Idk why it is too much on left side.
On explorer got issue with menu – it got cropped for like few pixels from bottom. Also post box is messed.
Mozilla – got small but very notable issue – box where is article is moved down for few px. (so the whole box is under colored square which is in left side. Hope you will understand my issues and will help me!

Sorry for my english, it isnt my native!

Also i am using newest wordpress.