Код HTML

<div class="preloader">
    <div class="loader-text">LOADING</div>
    <div class="loader"></div>
</div>

Код CSS

.preloader {
    background: #222;
    position: fixed;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    z-index: 9999;
}
 
.loader-text {
    display: block;
    position: absolute;
    top: 50%;
    left: 50%;
    color: #999;
    width: 100px;
    height: 30px;
    margin: -7px 0 0 -45px;
    text-align: center;
    font-family: 'PT Sans Narrow', sans-serif;
    font-size: 20px;
}
 
.loader {
    display: block;
    position: relative;
    left: 50%;
    top: 50%;
    width: 170px;
    height: 170px;
    margin: -85px 0 0 -85px;
    border: 3px solid #F00;
}
 
.loader:after {
    content: "";
    position: absolute;
    border: 3px solid #0F0;
    left: 15px;
    right: 15px;
    top: 15px;
    bottom: 15px;
}
 
.loader:before {
    content: "";
    position: absolute;
    border: 3px solid #00F;
    left: 5px;
    right: 5px;
    top: 5px;
    bottom: 5px;
}
 
.loader {
    border: 3px solid transparent;
    border-top-color: #4D658D;
    border-bottom-color: #4D658D;
    border-radius: 50%;
    animation: loader 2s linear infinite;
}
 
.loader:before {
    border: 3px solid transparent;
    border-top-color: #D4CC6A;
    border-bottom-color: #D4CC6A;
    border-radius: 50%;
    animation: loader 3s linear infinite;
}
 
.loader:after {
    border: 3px solid transparent;
    border-top-color: #84417C;
    border-bottom-color: #84417C;
    border-radius: 50%;
    animation: loader 1.5s linear infinite;
}
 
@keyframes loader {
    0% {
        -webkit-transform: rotate(0deg);
        -ms-transform: rotate(0deg);
        transform: rotate(0deg);
    }
    100% {
        -webkit-transform: rotate(360deg);
        -ms-transform: rotate(360deg);
        transform: rotate(360deg);
    }
}

Код JavaScript

$(window).on('load', function() {
  $('.loader').delay(1000).fadeOut();
  $('.preloader').delay(1000).fadeOut('slow');
})