Hello beautiful coders!!!

Ok, so to get to the point, here's the situation. I have a personal website at TheLanternLight.com and one of the pages is my personal blog. Currently I use WordPress and I've been very, very happy with it for many years. However with the advent of Tumblr and it's ability to easily reblog and connect to other... well you don't care, the point is I'd like to replace my WordPress with my Tumblr.

Because of this, I'll need to edit my Tumblr to look like my WordPress.

Here is my website with WordPress in it: TheLanternLight.com

As you can see it's made to fit into the window of my website's theme. And to do this I sort of halved my HTML coding between [upper half] [the wordpress] [lower half]. So I was wondering if you guys could help me figure out how to do this with my tumblr? The background image needs to be stationary and all the content kept within its height and width. And that's generally it. There's the other theme elements and the navigation but... well looking at Tumblr's "Edit HTML" feature it's rife with all kinds of HTML and mostly CSS tags, some of which look to be specific to Tumblr.

Is there a way to basically turn my Tumblr into my current WordPress template?

Thank you so much to anyone who can help at all. I really, really appreciate it.