body 
{
    font-family:Arial,Verdana,Tahoma,Sans-Serif;
    background-image:url(images\bg_pro.jpg);
    background-repeat:no-repeat;
    margin:0;
    
}

.imgb {
  border-color:Red;
  border-style:none;
  border-width:thin;
  
}

.imgb:hover {
  border-color:Red;
  border-style:dotted;
  border-width:1px;
 }