Displaying a variable length and height 2D array of squares on a web page

I'm developing a web application that displays a stack of shipping containers in a 2D array format. The width and height of the stack can vary so I'm wondering if there is an efficient way to produce a grid/table of squares that will represent the container stack reliably. The container locations will be pulled from a database.

Stack Of Shipping Containers

Command Line representation of container indexes (0 indicates empty space)