var buttonColours=["red", "blue", "green", "yellow"];
var gamePattern=[];

function nextSequence(){
  var randomNumber = Math.floor(Math.random()*4);
  var randomChosenColour= buttonColours[randomNumber];
  gamePattern.push(randomChosenColour);
  $("#randomChosenColour").fadeOut(100).fadeIn(100).fadeOut(100).fadeIn(100);
 }