How do I make a vertical line down the middle, also a horizontal line centered?

HTML & CSS
2

I did it using this code and it worked. This was in it but I removed it.
transform: transitionX(-50%);

I don’t think it belonged in there cause it works without it.


.verticalLine {
  position: absolute;
  background-color: blue;
  width: 6px;
  top: 91px;
  bottom: 0px;
  left: 50%;
}