How do I move a box to the center of a screen

Question

Trying to make a hallway of a game but I can’t figure out how to position a quadrilateral in the bottom center of the screen

Answer 1

use css

#box
{
margin-left: auto
margin-right: auto;
width: 100px; // this depend on you
height: 100px; // this depend on you
position: relative;
top: calc(100% - 100px);
}

a sample code:
https://code.sololearn.com/WXHF0UO875DS/?ref=app

Answer 2

post your code link with the question , so the others can easily help you .☺☺

Answer 3

Okay thanks for the tip