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

Sascha Schulz

2023-09-12 3746a867f82bc09b1240b54370b3608677f779bc

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function foo() { 
    console.log("foo"); 
} 
 
function bar(a) { 
    return a; 
} 
 
foo(); 
 
const a = bar(1); 
 
console.log(a);