Only have 1 scrollbar for entire page

Question

I've split the screen horizontally into 2 sections (left & right)

However, the 2 scrollbars are appearing on the right side of each section

How can we make it so that there's only 1 scrollbar for entire page?

Thanks!

I've wrapped the left & right class with a class named split

.split {
  height: 70%;
  width: 50%;
  position: fixed;
  z-index: 1;
  top: 100px;
  overflow-x: hidden;
  //overflow-y: hidden;
  padding-top: 300px;
  display:flex;
  
}

.left {
  left: 0;
  top: 80px;
}

.right {
  right: 0;
  top: 80px;
}