[ramesh_umk3]

Suppose if any users used align it will not be applicable for bbcode remember that

<center><div style="padding: 0px 5px 0px 5px; border: 1px solid #DF7401; margin-left: 20px; width: 40%"><div align="center" style="text-transform: none; border-bottom: none; display: block; padding: 3px 0px 3px 0px;">
<span onClick="var spoiler = this.parentNode.parentNode.getElementsByTagName('d iv')[2];
if (spoiler.style.display != ''){
this.parentNode.parentNode.style.width = '80%'
this.parentNode.style.borderBottom = '1px solid #CCCCCC';
spoiler.style.display = '';
this.getElementsByTagName('a')[0].innerHTML = '->Close Spoiler<-';
}else{
this.parentNode.parentNode.style.width = '40%'
this.parentNode.style.borderBottom = 'none';
spoiler.style.display = 'none';
this.getElementsByTagName('a')[0].innerHTML = '->Open Spoiler<-';
}" />
<a rel="nofollow" href="#" onClick="return false;" style="text-decoration: none;"><b style="font-size: 0.8em;">->Spoiler ?ffnen<-</b></a>
</span>
</div>
<div class="quotecontent">
<div align="center" style="display: none; padding: 5px 0px 5px 0px; font-size:18px;"><br> {param}</div>
</div>
</div></center><br />

just increase or decrease of font-size:18px;

Simpler Spoilers are good which takes less space of postbit:
Demo