function changeStyle() {

let fP = document.getElementById('firstP');

fP.style.textAlign = 'center';

let sP = document.getElementById('secondP')

sP.style.textAlign = 'right';

let midP = document.getElementsByClassName('middleP');

midP[0].style.backgroundColor = 'blue';

midP[0].style.color = 'cyan';

midP[1].style.backgroundColor = 'blue';

midP[1].style.color = 'cyan';

var colorList = new Array('yellow', 'black', 'cyan', 'white', 'Yellow', 'red');

var bgColorList = ['red', 'white', 'blue', 'black','green', 'orange'];

var paragraph = document.getElementsByTagName('p');

var fifthP = paragraph[4];

var i = 0;

setInterval(function keepChange(){

fifthP.style.backgroundColor = bgColorList[i];

fifthP.style.color = colorList[i];

i += 1;

if (i == colorList.length){

i = 0;

}

console.log(i);

}, 3000);

}

function hiddenP(){

var newP = document.createElement('p');

newP.innerHTML = 'Stage 6: Deployment in the Market and Maintenance';

window.document.body.appendChild(newP);

document.getElementById('hiddenPara').disabled = true;

}

function reloadPage() {

window.location.reload();

document.getElementById('hiddenPara').disabled = false;

}