How do I execute this javascript along side html and css?

I’m currently using this domain as my url. [https://morsetovoynich.000webhostapp.com/](url) This should be a simple procedure as I would like to use the anagram javacript code at my site. How do I implement the javascript code with html and css so I have a functional url? I can log in and ftp to my url so that’s not an issue. When I upload and its done all I see is a blank screen. I need help with this as I have a working axiom for an extreme cryptographic cipher known as the [https://www.jasondavies.com/voynich/#f1r/0.655/0.452/1.90](url).

` var generateAnagrams = (function() {
// precomputed first 20 factorials
var fact20 = [1, 2, 6, 24, 120, 720, 5040, 40320, 362880, 3628800, 39916800, 479001600, 6227020800, 87178291200, 1307674368000, 20922789888000, 355687428096000, 6402373705728000, 121645100408832000, 2432902008176640000];
// Substrings seen already which we can cache. Try and avoid stack overflow as much as possible
var seenStrings = {};

function generateAnagrams(word) {
var length = word.length;
if (length < 2) {
seenStrings[word] = word;
return [word];
}
var anagrams = Array(fact20[length – 1]);

// Stuff we’ll need along the way
var before, focus, after;
var shortWord, subAnagrams, newEntry;
var idx = 0, j, jlen;

for (var i = 0; i < length; i++) {
before = word.slice(0, i);
focus = word[i];
after = word.slice(i + 1, word.length + 1);
shortWord = before + after;
subAnagrams = seenStrings[shortWord] || generateAnagrams(shortWord);
for (j = 0, jlen = subAnagrams.length; j < jlen; j++) {
newEntry = focus + subAnagrams[j];
anagrams[idx++] = newEntry;
}
}
seenStrings[word] = anagrams;
return anagrams;
}

return function anagrams(word) {
var computed = generateAnagrams(word);
// clear cache (going to consume a ton of memory)
seenStrings = {};
return computed;
};

})();`

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