Em cũng có nhưng nó mượt hơn
Demo: https://www.nguyenhoangdat.gq/
CSS:
#snowflakeContainer{position:absolute;left:0px;top:0px;}
.snowflake{padding-left:15px;font-size:14px;line-height:24px;position:fixed;color:#ebebeb;user-select:none;z-index:1000;-moz-user-select:none;-ms-user-select:none;-khtml-user-select:none;-webkit-user-select:none;-webkit-touch-callout:none;}
.snowflake:hover {cursor:default}
HTML Dán Trước </body>
<div id='snowflakeContainer'>
<p class='snowflake'><img style="width:20px" src="https://1.bp.blogspot.com/-CXx9jt2JMRk/Vq-Lh5fm88I/AAAAAAAASwo/XivooDn_oSY/s1600/hoamai.png" /></p>
</div>
Java Script
<script>
//<![CDATA[
var requestAnimationFrame=window.requestAnimationFrame||window.mozRequestAnimationFrame||window.webkitRequestAnimationFrame||window.msRequestAnimationFrame;var transforms=["transform","msTransform","webkitTransform","mozTransform","oTransform"];var transformProperty=getSupportedPropertyName(transforms);var snowflakes=[];var browserWidth;var browserHeight;var numberOfSnowflakes=39;var resetPosition=false;function setup(){window.addEventListener("DOMContentLoaded",generateSnowflakes,false);window.addEventListener("resize",setResetFlag,false)}setup();function getSupportedPropertyName(b){for(var a=0;a<b.length;a++){if(typeof document.body.style[b[a]]!="undefined"){return b[a]}}return null}function Snowflake(b,a,d,e,c){this.element=b;this.radius=a;this.speed=d;this.xPos=e;this.yPos=c;this.counter=0;this.sign=Math.random()<0.5?1:-1;this.element.style.opacity=0.5+Math.random();this.element.style.fontSize=4+Math.random()*30+"px"}Snowflake.prototype.update=function(){this.counter+=this.speed/5000;this.xPos+=this.sign*this.speed*Math.cos(this.counter)/40;this.yPos+=Math.sin(this.counter)/40+this.speed/30;setTranslate3DTransform(this.element,Math.round(this.xPos),Math.round(this.yPos));if(this.yPos>browserHeight){this.yPos=-50}};function setTranslate3DTransform(a,c,b){var d="translate3d("+c+"px, "+b+"px, 0)";a.style[transformProperty]=d}function generateSnowflakes(){var b=document.querySelector(".snowflake");var h=b.parentNode;browserWidth=document.documentElement.clientWidth;browserHeight=document.documentElement.clientHeight;for(var d=0;d<numberOfSnowflakes;d++){var j=b.cloneNode(true);h.appendChild(j);var e=getPosition(50,browserWidth);var a=getPosition(50,browserHeight);var c=5+Math.random()*40;var g=4+Math.random()*10;var f=new Snowflake(j,g,c,e,a);snowflakes.push(f)}h.removeChild(b);moveSnowflakes()}function moveSnowflakes(){for(var b=0;b<snowflakes.length;b++){var a=snowflakes[b];a.update()}if(resetPosition){browserWidth=document.documentElement.clientWidth;browserHeight=document.documentElement.clientHeight;for(var b=0;b<snowflakes.length;b++){var a=snowflakes[b];a.xPos=getPosition(50,browserWidth);a.yPos=getPosition(50,browserHeight)}resetPosition=false}requestAnimationFrame(moveSnowflakes)}function getPosition(b,a){return Math.round(-1*b+Math.random()*(a+2*b))}function setResetFlag(a){resetPosition=true};
//]]>
</scrpit>
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