Hình ảnh đầu tiên khi load website - pre-loader

 

Demo : https://diensaoviet.com/

**JS

<script type="text/javascript">

   setTimeout(function(){

       $("#pre-loader").fadeOut(1000);

   },500); 

</script>

**HTML

<div id="pre-loader">

    <div class="loader"></div>

</div>

**CSS

<style type="text/css">

/*----------Loading-------------*/

#pre-loader{background: #F5F5F5;position: fixed;top: 0;left: 0;width: 100%;height: 100%;z-index: 9999;}

.loader {position: relative;width: 2.5em;height: 2.5em;transform: rotate(165deg);  position: absolute;top: calc(50% - 1.25em);left: calc(50% - 1.25em);}

.loader:before, .loader:after {content: '';position: absolute;top: 50%;left: 50%;display: block;width: 0.5em;height: 0.5em;border-radius: 0.25em;transform: translate(-50%, -50%);}

.loader:before {animation: before 2s infinite;}

.loader:after {animation: after 2s infinite;}

@keyframes before {0% {width: 0.5em;box-shadow: 1em -0.5em rgba(225, 20, 98, 0.75), -1em 0.5em rgba(111, 202, 220, 0.75);}35% {width: 2.5em;box-shadow: 0 -0.5em rgba(225, 20, 98, 0.75), 0 0.5em rgba(111, 202, 220, 0.75);}70% {width: 0.5em;box-shadow: -1em -0.5em rgba(225, 20, 98, 0.75), 1em 0.5em rgba(111, 202, 220, 0.75);}100% {box-shadow: 1em -0.5em rgba(225, 20, 98, 0.75), -1em 0.5em rgba(111, 202, 220, 0.75);}}

@keyframes after {0% {height: 0.5em;box-shadow: 0.5em 1em rgba(61, 184, 143, 0.75), -0.5em -1em rgba(233, 169, 32, 0.75);}35% {height: 2.5em;box-shadow: 0.5em 0 rgba(61, 184, 143, 0.75), -0.5em 0 rgba(233, 169, 32, 0.75);}70% {height: 0.5em;box-shadow: 0.5em -1em rgba(61, 184, 143, 0.75), -0.5em 1em rgba(233, 169, 32, 0.75);}100% {box-shadow: 0.5em 1em rgba(61, 184, 143, 0.75), -0.5em -1em rgba(233, 169, 32, 0.75);}}

/*----------Loading-------------*/

</style>