div.sent{
 border-left:1px dashed #666600;
 border-top:1px dashed #666600;
 border-bottom:1px dashed #666600;
 line-height:130%;padding:5px;
 background-color:#ffffff;
 width:80%;
}

div.nakami{
 margin:5px 0 300px 1em;
 line-height:1.6em;
 }