Bootstrap 3 comes with a complex grid system to permit a perfect positioning of elements in all views. The editor can find several possibilities for the grid elements in the back-end, depending on the view (smartphone, tablet, desktop, big screen).
The standard version of bootstrap has a system with 12 columns. You can change this if you want to.
Demos
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Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.
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.col-md-8
.col-md-4
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.col-md-6
.col-md-6