Các bước thực hiện
Chỉ cần một bước Các bạn thêm đoạn code bên dưới vào trước thẻ body<div id="preloader">
<div class="spinner">
<span class="ball-1"></span>
<span class="ball-2"></span>
<span class="ball-3"></span>
<span class="ball-4"></span>
<span class="ball-5"></span>
<span class="ball-6"></span>
<span class="ball-7"></span>
<span class="ball-8"></span>
</div>
</div>
<style>
/* Preloader */
#preloader{overflow:hidden;background:#fff;left:0;right:0;top:0;bottom:0;position:fixed;z-index:9999}
.spinner{position:absolute;top:50%;left:49.5%;z-index:1;height:20px;width:20px;transform:translate(-50%,-50%)}
[class^="ball-"]{position:absolute;display:block;left:30px;width:6px;height:6px;border-radius:6px;transition:all 0.5s;animation:circleRotate 4s both infinite;transform-origin:0 250% 0}
@keyframes circleRotate{0%{transform:rotate(0deg)}100%{transform:rotate(1440deg)}}
.ball-1{z-index:-1;background-color:#2196F3;animation-timing-function:cubic-bezier(0.5,0.3,0.9,0.9)}
.ball-2{z-index:-2;background-color:#03A9F4;animation-timing-function:cubic-bezier(0.5,0.6,0.9,0.9)}
.ball-3{z-index:-3;background-color:#00BCD4;animation-timing-function:cubic-bezier(0.5,0.9,0.9,0.9)}
.ball-4{z-index:-4;background-color:#009688;animation-timing-function:cubic-bezier(0.5,1.2,0.9,0.9)}
.ball-5{z-index:-5;background-color:#4CAF50;animation-timing-function:cubic-bezier(0.5,1.5,0.9,0.9)}
.ball-6{z-index:-6;background-color:#8BC34A;animation-timing-function:cubic-bezier(0.5,1.8,0.9,0.9)}
.ball-7{z-index:-7;background-color:#CDDC39;animation-timing-function:cubic-bezier(0.5,2.1,0.9,0.9)}
.ball-8{z-index:-8;background-color:#FFEB3B;animation-timing-function:cubic-bezier(0.5,2.4,0.9,0.9)}
@media screen and (max-width:800px){.spinner{left:43%}}
</style>
<script>
// Preloader
$(window).load(function(){$("#loader").fadeOut(),$("#preloader").delay(350).fadeOut("slow"),$("body").delay(350).css({overflow:"visible"})});
</script>
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