Loading Gif Preloader

<!doctype html>

<html>
  <head>
    <link rel="stylesheet" href="style.css">
  </head>

  <body>

    <div class="loader-wrapper">
<!-- Loading square for squar.red network -->
<span class="loader"><span class="loader-inner"></span></span>
</div>

<script>
  $(window).on("load",function(){
    $(".loader-wrapper").fadeOut("slow");
  });
</script>
  </body>
</html>




body, html {
    height: 100%;
    text-align: center;
}

body {
  background-color: #242F3F;
}

.loader-wrapper{
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  background-color: aquamarine;
  display: flex;
  justify-content: center;
  align-items: top;
  
}
.loader {
  display: inline-block;
  width: 30px;
  height: 30px;
  position: relative;
  border: 4px solid #Fff;
  top: 50%;
  animation: loader 2s infinite ease;
}

.loader-inner {
  vertical-align: top;
  display: inline-block;
  width: 100%;
  background-color: #fff;
  animation: loader-inner 2s infinite ease-in;
}

@keyframes loader {
  0% {
    transform: rotate(0deg);
  }
  
  25% {
    transform: rotate(180deg);
  }
  
  50% {
    transform: rotate(180deg);
  }
  
  75% {
    transform: rotate(360deg);
  }
  
  100% {
    transform: rotate(360deg);
  }
}

@keyframes loader-inner {
  0% {
    height: 0%;
  }
  
  25% {
    height: 0%;
  }
  
  50% {
    height: 100%;
  }
  
  75% {
    height: 100%;
  }
  
  100% {
    height: 0%;
  }
}