I'm trying to move my container that has some texts to overlap my high-charts and have it be on top of the high-charts block. I tried using CSS z-index and stetting the text container to 1 while the high-charts z-index is 0 but it does not work. Any ideas? 

Hi Thuan Pham,

When overlaping containers, do not forget to make an outside container with position: relative; and inside containers with position: absolute;

For more information see this document.