Prompting

/* make a "the matrix" kind of moving background */

var matrix = document.createElement('div');

matrix.style.position = 'absolute';

matrix.style.top = '0px';

matrix.style.left = '0px';

matrix.style.width = '100%';

matrix.style.height = '100%';

matrix.style.backgroundColor = 'black';

matrix.style.color = 'green';

matrix.style.fontFamily = 'monospace';

matrix.style.fontSize = '12px';

matrix.style.overflow = 'hidden';

document.body.appendChild(matrix);

var matrixLines = [];

var matrixLineCount = 100;

var matrixLineHeight = 12;

var matrixLineWidth = 1200;

var matrixLineSpeed = 5;

for (var i = 0; i < matrixLineCount; i++) {

  var matrixLine = document.createElement('div');

  matrixLine.style.position = 'absolute';

  matrixLine.style.top = (i * matrixLineHeight) + 'px';

  matrixLine.style.left = '0px';

  matrixLine.style.width = matrixLineWidth + 'px';

  matrixLine.style.height = matrixLineHeight + 'px';

  matrixLine.style.overflow = 'hidden';

  matrix.appendChild(matrixLine);

  matrixLines.push(matrixLine);

}

var matrixCharacters = '01';

function matrixUpdate() {

  for (var i = 0; i < matrixLineCount; i++) {

    var matrixLine = matrixLines[i];

    var matrixLineLeft = parseInt(matrixLine.style.left);

    matrixLineLeft -= matrixLineSpeed;

    if (matrixLineLeft < -matrixLineWidth) {

      matrixLineLeft += matrixLineWidth;

    }

    matrixLine.style.left = matrixLineLeft + 'px';

    var matrixLineText = '';

    for (var j = 0; j < matrixLineWidth; j++) {

      matrixLineText += matrixCharacters.charAt(Math.floor(Math.random() * matrixCharacters.length));

    }

    matrixLine.innerHTML = matrixLineText;

  }

}

setInterval(matrixUpdate, 50);

/* make a text input box to write the right password "trythis" */

var password = document.createElement('input');

password.type = 'text';

password.style.position = 'absolute';

password.style.top = '0px';

password.style.left = '0px';

password.style.width = '100%';

password.style.height = '100%';

password.style.fontSize = '100px';

password.style.textAlign = 'center';

password.style.backgroundColor = 'transparent';

password.style.color = 'white';

password.style.border = 'none';

password.style.outline = 'none';

password.style.zIndex = '1';

password.onkeyup = function() {

  if (password.value == 'trythis') {

    alert('You win!');

  }

};

document.body.appendChild(password);

/* if the correct password is typed, then display this image https://www.telegraph.co.uk/content/dam/films/2021/09/09/unnamed_trans_NvBQzQNjv4Bqi42G8AkSNAnhxk6tBN6ZQoJMtjt4LtnbqRf1zh2-BA8.png */

var image = document.createElement('img');

image.src = 'https://www.telegraph.co.uk/content/dam/films/2021/09/09/unnamed_trans_NvBQzQNjv4Bqi42G8AkSNAnhxk6tBN6ZQoJMtjt4LtnbqRf1zh2-BA8.png';

image.style.position = 'absolute';

image.style.top = '0px';

image.style.left = '0px';

image.style.width = '100%';

image.style.height = '100%';

image.style.zIndex = '2';

image.style.display = 'none';

document.body.appendChild(image);

password.onkeyup = function() {

  if (password.value == 'trythis') {

    image.style.display = 'block';

  }

};