添加到自定义页脚就行
<style>.a{animation:a .4s cubic-bezier(.34,1.56,.64,1) forwards!important;will-change:opacity,transform}@keyframes a{from{opacity:0;transform:translate3d(0,20px,0);filter:blur(4px)}to{opacity:1;transform:translate3d(0,0,0);filter:none}}@media(max-width:768px){@keyframes a{from{opacity:0;transform:translate3d(0,15px,0)}to{opacity:1;transform:translate3d(0,0,0)}}}.DiscussionList,.DiscussionListItem{animation:b .35s cubic-bezier(.25,1,.5,1) forwards;will-change:opacity,transform}.PostStream-item{animation:b .35s cubic-bezier(.25,1,.5,1) forwards;will-change:opacity,transform;position:relative!important}@keyframes b{from{opacity:0;transform:translate3d(0,10px,0)}to{opacity:1;transform:translate3d(0,0,0)}}.Dropdown-menu{z-index:1050!important}.CommentPost .Dropdown,.Post-actions,.Post-controls{position:relative!important;z-index:10!important}.PostStream-item:focus-within,.PostStream-item:hover{z-index:5!important}</style>
<script>document.addEventListener('DOMContentLoaded',()=>{let e=document.getElementById('app'),t,n;if(!e)return;n=(e.className||'').match(/App--[a-zA-Z0-9-]+/)?.[0]||'';const o=()=>{(t=document.getElementById('content'))&&(t.classList.remove('a'),void t.offsetWidth,t.classList.add('a'))};new MutationObserver(m=>{for(let r of m)if(r.attributeName=='class'){let c=(e.className||'').match(/App--[a-zA-Z0-9-]+/)?.[0]||'';c!==n&&(n=c,o())}}).observe(e,{attributes:1,attributeFilter:['class']});o()});</script>