change example for viewport, add examples for css units and css flexbox

Sascha Schulz

2023-09-12 3746a867f82bc09b1240b54370b3608677f779bc

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const fs = require("fs"); 
 
fs.readFile("./hello.txt", {encoding: "utf8"}, function(error, data) { 
    console.log(data); 
});