Make a table with equal column widths

Setting the width for each cell explicitly is the straightforward way to give all columns the same width.
For example, the CSS declaration below splits a table of four columns into parts whose widths are the same:

table td {
  width: 25%;
}

However, the approach doesn't work if the table has a dynamic number of columns. Fortunately, we can use the table-layout property to do that.
No matter what how many columns the table has, they will have the same widths.

table {
  table-layout: fixed;
}

Demo