.coop_stock_popup {
  display: none;
  position: fixed;
  background-color: #00ff99;
  box-shadow: 10px 10px 60px #555;
  left: 30%;
  top: 30%;
  height: auto;
  width: 60%;
  max-width: 50%; 
  max-height: 50%; 
  vertical-align: middle;
  border-radius: 8px;
  padding: 15px 5%;
  z-index: 100;
}

.coop_stock_popup_close {
  position: absolute;
  background-color: #009911;
  border: 3px solid #999;
  border-radius: 50px;
  cursor: pointer;
  display: inline-block;
  font-family: arial;
  font-weight: bold;
  top: -20px;
  right: -20px;
  font-size: 25px;
  line-height: 30px;
  width: 30px;
  height: 30px;
  text-align: center;
}

.coop_stock_popup_close:hover {
  background-color: #ccc;
}