How Can I Accomplish This ?

Hello,

Can someone help me do this ? i want the first widget to be 100% width and the 2 other widgets below 50%.
The theme (twenty sixteen)only has 2 widget area's.

please see example below
what it is right now :
[​IMG]

What i am after

[​IMG]
the url where you can see this is :
http://ift.tt/29TDuUG
I am using...

How Can I Accomplish This ?

from HTML & Website Design http://ift.tt/29TPOZ0
via IFTTT
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