如何防止JavaScript中标签重叠

I am trying add labels on sphere, but I am unable to do it only one label is attaching to the sphere and the rest of labels are overlapping to the corner of the screen. I have also uploaded the image where you can see the problem. Maybe its css problem,but I dont know exactly. And also I have added the full code. Please help me with the problem.I am trying add labels on sphere, but I am unab