Loader

index.html

<div id="circle_container">
  <div id="stars"></div>
  <div id="load_wrapper">
    <div id="sun"></div>
    <div id="moon"></div>
  </div>
</div>
<h1 id="loading_text">Loading</h1>

loader.markdown

Loader

A nice loader to show that the server and/or client are crunching data just for you :-).

A Pen by Casper Cromjongh on CodePen.

License.

script.js

function getRandom (size)
{
  return Math.floor(Math.random() * size);
}

//Creating the layers for the stars
for (i = 2; i < 12; i++)
{
  $("#stars").append('<div class="star_layer" style="transform: translateZ(' + i + 'px) scale(' + (15 - i)/(15) +');"></div>')
}

//Creating the stars
for (i = 0; i < 70; i++)
{
  $(".star_layer").eq(getRandom(10)).append('<div class="star"></div>');
}

updateStars();

//Change stars every cycle
setInterval(updateStars, 4000);

//Randomising stars. Position and opacity is changed every cycle.
function updateStars ()
{
  $(".star").each(function() {
    $(this).css({"top": getRandom(200) + "px", "left": getRandom(200) + "px", "opacity": (20 + getRandom(50))/100});
  });
}

scripts

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>

style.css

*
{
  margin: 0;
  padding: 0;
}

/*Replace by a container if needed*/
body
{
  height: 100vh;
  width: 100%;
  background-color: #DDD;
  position: absolute;
}

#circle_container
{
  height: 200px;
  width: 200px;
  position: absolute;
  /*Centering*/
  top: 50%;
  left: 50%;
  transform: translateX(-50%) translateY(-50%);
  
  border-radius: 50%;
  background-color: #DDD;
  overflow: hidden;
  animation: background 4s -3.5s infinite;
  /*Nice modern drop-shadow*/
  box-shadow: 0 8px 25px rgba(0,0,0,0.4);
}

#load_wrapper
{
  height: 300%;
  width: 300%;
  margin-left: -50px;
  transform: translate3d(-25%, 0, 0);
  position: relative;
  animation: rotation 4s linear infinite;
}

#sun, #moon
{
  position: absolute;
  border-radius: 50%;
  /*Make sure they are in the middle*/
  left: 50%;
  transform: translateX(-50%);
}

#sun
{
  width: 80px;
  height: 80px;
  background-color: #FFD475;
  top: 40px;
  box-shadow: 0 0 15px #FFCB57;
}

#moon
{
  width: 50px;
  height: 50px;
  background-color: #EEE;
  top: 450px;
  box-shadow: 0 0 25px rgba(0,0,0,0.2) inset, 0 0 10px white;
}

#stars
{
  /*Has to be more than the amount of layers*/
  perspective: 15px;
	
  width: 100%;
  animation: stars 4s linear infinite;
  opacity: 0.8;
}

.star
{
  width: 4px;
  height: 4px;
  background-color: white;
  position: absolute;
  border-radius: 50%;
}

.star_layer
{
  position: absolute;
  width: 200px;
  height: 200px;
  /*This is to make sure the upper-Z layer's don't shift downward*/
  transform-origin: 100px 0;
}

#loading_text
{
  text-align: center;
  font-family: 'Roboto', sans-serif;
  position: absolute;
  top: calc(50% - 135px);
  transform: translateY(-50%);
  width: 100%;
  line-height: 1;
  color: #555;
  font-size: 40px;
}

@keyframes rotation
{
  0% {
    transform: translate3d(-25%, 0, 0) rotate(0deg);
  }
  20% {
    /*Sun goes down*/
    transform: translate3d(-25%, 0, 0) rotate(50deg);
  }
  30% {
    /*Moon rises*/
    transform: translate3d(-25%, 0, 0) rotate(130deg);
  }
  70% {
    /*Moon goes down*/
    transform: translate3d(-25%, 0, 0) rotate(240deg);
  }
  80% {
    /*Sun rises*/
    transform: translate3d(-25%, 0, 0) rotate(310deg);
  }
  100% {
    transform: translate3d(-25%, 0, 0) rotate(360deg);
  }
}

@keyframes background
{
  0% {
    background-color: #2896C3;
  }
  50% {
    /*Night*/
    background-color: #1E5267;
  }
  100% {
    background-color: #2896C3;
  }
}

@keyframes stars
{
  0% {
    /*Invisible, not moving*/
    opacity: 0;
    padding-right: 0;
  }
  25% {
    /*Start of movement*/
    opacity: 0;
    padding-right: 0;
  }
  50% {
    /*Visible*/
    opacity: 1;
    padding-right: 25px;
  }
  75% {
    opacity: 0;
    padding-right: 50px;
  }
  100% {
    opacity: 0;
    padding-right: 0;
  }
}