看到一个博客上有这个倒计时，顺便带来过了
由于在md插入css代码会被注释，所以css我单独写在了文件里
源码在下面，想要拿走，自己部署

html代码

<!--倒计时开始-->
<div class="gn_box">
<h1><font color=#E80017>2</font><font color=#D1002E>0</font><font color=#BA0045>2</font><font color=#A3005C>0</font><font
color=#8C0073>年</font><font color=#75008A>-</font><font color=#5E00A1>新</font><font
color=#4700B8>年</font><font color=#3000CF>倒</font><font color=#1900E6>计</font><font color=#0200FD>时</font>
</h1>
<center>
<div id="CountMsg" class="HotDate">
<span id="t_d">0 天</span>
<span id="t_h">0 时</span>
<span id="t_m">0 分</span>
<span id="t_s">0 秒</span>
</div>
</center>
<script type="text/javascript"> function getRTime() {
var EndTime = new Date('2021/02/12 00:00:00');
var NowTime = new Date();
var t = EndTime.getTime() - NowTime.getTime();
var d = Math.floor(t / 1000 / 60 / 60 / 24);
var h = Math.floor(t / 1000 / 60 / 60 % 24);
var m = Math.floor(t / 1000 / 60 % 60);
var s = Math.floor(t / 1000 % 60);
document.getElementById("t_d").innerHTML = d + " 天";
document.getElementById("t_h").innerHTML = h + " 时";
document.getElementById("t_m").innerHTML = m + " 分";
document.getElementById("t_s").innerHTML = s + " 秒";
}
setInterval(getRTime, 1000);
</script>
</div>
<!--倒计时结束-->

css代码

/* 倒计时开始 */
.gn_box {
padding: 10px 14px;
margin-bottom: 20px;
text-align: center;
background-color: transparent;
}
#t_d{
color: #982585;
font-size: 18px;
}
#t_h{
color: #8f79c1;
font-size: 18px;
}
#t_m{
color: #65b4b5;
font-size: 18px;
}
#t_s{
color: #83caa3;
font-size: 18px;
}