.scroll {  
  width:190px;  
  height:225px;  
  overflow:auto;  
}  
.ChatMess1 {border:1px solid #ccc; background:#fff; margin-bottom:3px; -webkit-border-radius:2px  
  2px 2px 2px;-moz-border-radius:2px 2px 2px 2px;border-radius:2px 2px 2px 2px;}  
  .ChatMesTop2 {border:0px; border-bottom:1px dotted #ccc; padding:3px 3px 3px 4px;  
  background:#f8f8f8; -webkit-border-radius:2px 2px 0px 0px;-moz-border-radius:2px 2px 0px 0px;border-radius:2px 2px 0px 0px;}  
  .ChatMesTop1 {border:0px; border-top:1px dotted #ccc; padding:3px 3px 3px 4px;  
  background:#f8f8f8; -webkit-border-radius:2px 2px 0px 0px;-moz-border-radius:2px 2px 0px 0px;border-radius:2px 2px 0px 0px;}  
  .new1 {text-align:left;padding:5px;border-bottom:1px solid #F9F5DD;margin:0px;background:#DBDBDB;cursor:pointer;font-size:8pt;} .new01 {text-align:left;padding:5px;border-bottom:1px solid #F9F5DD;margin:0px;background:#F1F1F1;font-size:8pt;}

<div class="scroll">$MYINF_4X$</div>