Fix ac-container position adding styles to parent element

[kesiah]

Hi!,

I had some problems with ac-container position when it is inside a tag with the attribute position relative / absolute /etc.

To solve it, I wrapped the element with the class "mass-autocomplete", which has a position relative, so the position of ac-container is absolute. I removed the left attribute and changed the top attribute calculation.

As well as solving the explained problem easily, it would help to position the ac-container under the input or on it too.

I hope it helps! ;) Thank you!