#ChristmasContainer 
{
    position: fixed;
    width: calc(100% - 100px);
    height: 100vh;
    z-index:2; 
    pointer-events:none;
}
#ChristmasContainer > div 
{
    position: absolute;
    width: 50px;
    height: 50px;
    
    /* We use the following properties to apply the fade and drop animations to each Christmas.
       Each of these properties takes two values. These values respectively match a setting
       for fade and drop.
    */
    -webkit-animation-iteration-count: infinite, infinite;
    -webkit-animation-direction: normal, normal;
    -webkit-animation-timing-function: linear, ease-in;
}

/* This CSS rule is applied to all img elements directly inside div elements which are
   directly inside the ChristmasContainer div. In other words, it matches the 'img' elements
   inside the ChristmasDivs which are created in the createAChristmas() function.
*/
#ChristmasContainer > div > img {
     position: absolute;
     width: 50px;
     height: 50px;

    /* We use the following properties to adjust the clockwiseSpin or counterclockwiseSpinAndFlip
       animations on each Christmas.
       The createAChristmas function in the Christmas.js file determines whether a Christmas has the 
       clockwiseSpin or counterclockwiseSpinAndFlip animation.
    */
     -webkit-animation-iteration-count: infinite;
     -webkit-animation-direction: alternate;
     -webkit-animation-timing-function: ease-in-out;
     -webkit-transform-origin: 30% -100%;
}


/* Hides a Christmas towards the very end of the animation */
@-webkit-keyframes fade
{
    /* Show a Christmas while into or below 95 percent of the animation and hide it, otherwise */
    0%   { opacity: 1; }
    95%  { opacity: 1; }
    100% { opacity: 0; }
}


/* Makes a Christmas fall from -300 to 600 pixels in the y-axis */
@-webkit-keyframes drop
{
    /* Move a Christmas to -300 pixels in the y-axis at the start of the animation */
    0%   { -webkit-transform: translate(-50px, -50px); }
    /* Move a Christmas to 600 pixels in the y-axis at the end of the animation */
    100% { -webkit-transform: translate(0px, 100vh); }
}

/* Rotates a Christmas from -50 to 50 degrees in 2D space */
@-webkit-keyframes clockwiseSpin
{
    /* Rotate a Christmas by -50 degrees in 2D space at the start of the animation */
    0%   { -webkit-transform: rotate(-50deg); }
    /*  Rotate a Christmas by 50 degrees in 2D space at the end of the animation */
    100% { -webkit-transform: rotate(50deg); }
}


/* Flips a Christmas and rotates it from 50 to -50 degrees in 2D space */
@-webkit-keyframes counterclockwiseSpinAndFlip 
{
    /* Flip a Christmas and rotate it by 50 degrees in 2D space at the start of the animation */
    0%   { -webkit-transform: scale(-1, 1) rotate(50deg); }
    /* Flip a Christmas and rotate it by -50 degrees in 2D space at the end of the animation */
    100% { -webkit-transform: scale(-1, 1) rotate(-50deg); }
}