What is the way to make these columns of equal height?

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There are several ways to make columns of equal height, depending on the specific requirements and constraints of the project. Here are some common methods:

1. Flexbox: Use CSS flexbox to align the columns vertically and distribute the available space evenly between them. This approach is particularly effective for modern browsers.

2. Grid: Use CSS grid to create a grid layout that spans the entire width of the container and evenly distributes the columns within the available space.

3. JavaScript: Use JavaScript to calculate the maximum height of the columns and set the height of each column to this value. This approach is reliable but may cause performance issues on larger pages.

4. Faux Columns: Use a background image that spans the entire height of the container to create the illusion of equal-height columns. This approach works well for designs that allow for a repeating pattern or texture as a background.

5. Table Display: Use the display: table; property in your CSS to create a table-like structure, then set the height of each cell to 100%. This approach is not considered the best practice in modern web development, but it works for legacy projects.