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              <h1>Nieve cayendo. CSS + JS. </h1>
<div id="capa"></div>
<footer>Para <a href="https://escss.blogspot.com/2016/07/creacion-elementos-animaciones-aleatorias.html" target="blank">EsCss</a>. </footer>
Sont des fous<br>
Que je blâme :<br>
Fi d'une flamme<br>
Qui nous ronge l'âme !<br>
Fais, mon cher, comme moi<br>
Pour braver la loi<br>
D'une amante<br>
<span>Charles-François Panard.</span>

              body {
height: 150vh; 
background-color: #bebec0; 
linear-gradient(transparent, #bebec0), url(https://docs.google.com/uc?id=0Bwv59jgRLbvUV3lWT0ZWZGR0Sk0); 
background-position: 0 65vw, 0 0; 
background-size: 100% 7vw, 100% auto; 
background-repeat: no-repeat; 
h1 {
width: 12em; 
margin: 20px auto; 
padding: .2em .15em; 
color: maroon; 
background-color: rgba(255,255,255,.3); 
text-align: center; 
border-radius: 1em; 
box-shadow: 0 0 .4em 0 rgba(255,255,255,1); 
#capa {
position: fixed; 
top: -10vh; left: 0; 
height: 120vh; 
width: 100vw; 
pointer-events: none; 
#capa .nieve { 
position: absolute; 
top: 0; left: 0; 
width: 2.2vmin; height: 2.2vmin; 
background: radial-gradient(circle, white 40%, transparent 75%); 
footer {
position: absolute; 
bottom: 20px; right: 10px; 
font-weight: bold; 
padding: .2em .15em; 
color: maroon; 
background-color: rgba(255,255,255,.5); 
text-align: center; 
border-radius: 1em; 
box-shadow: 0 0 .4em 0 rgba(255,255,255,1); 
p {
display: block; 
margin-top: 55vw; 
text-align: center; 
font: bold 2em/1.5 cursive; 
color: black; 
span {
color: dimgrey;
font: bold .6em/3 serif; 
margin-left: 20%; 

              onload = inicia; 

var cantidadCopos = 30; 

function inicia() {
  for(c=0; c<cantidadCopos; c++) {
  copo = document.createElement("div"); 
  copo.setAttribute("class", "nieve"); 

  for(n=0; n<cantidadCopos; n++) {
  document.querySelectorAll("#capa .nieve")[n].addEventListener("transitionend", function(){caida(this)}, false); 
  //document.querySelectorAll("#capa .nieve")[n].innerHTML = n;

    for(c=0; c<cantidadCopos; c++) {
    elCopo = document.querySelectorAll("#capa .nieve")[c]; 
    elCopo.style.left = Math.floor(Math.random()*100)+ "vw"; 
    elCopo.style.transition = "top 15ms linear"; 
    elCopo.style.top = elCopo.style.top = "1vh"; 
  }, 15);

function caida(T) {

  T.style.transition = "";
  T.style.top = "0"; 

  T.style.transitionProperty = "left, top"; 
  T.style.transitionDelay = Math.floor(Math.random()*3000)+ "ms"; 
  T.style.transitionDuration = (Math.floor(Math.random()*15000) + 5000)+ "ms"; 
  T.style.transitionTimingFunction = "ease-in, ease-out"; 
  T.style.left = Math.floor(Math.random()*100)+ "vw"; 
  T.style.top = "110vh"; 
  }, 15);  

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