Wrong cols calculation when terminal change size with css variable

[jcubic]

Issue summary

when tere is --size variable on terminal the calculation of cols is wrong (probably size of the character in calculation is wrong)

Expected behavior

I expect figlet.js to resize properly when using --size: 1.1 in demo

Actual behavior

the text is cut off because term.cols() is too big.

Steps to reproduce

1. Open Figlet + resize demo https://codepen.io/jcubic/pen/jOWvENE
2. Add --size: 1.1 to body .shell .terminal selector
3. Type: "hello world as we know it" and resize the terminal

Browser and OS

[jcubic]

The problem was that --size was added to selector other then bare .terminal, :root or body. When terminal is initialized it use fake terminal to get the size of the character that was wrong because the fake terminal use .terminal added to body.