#hover {
  position: fixed;
  background: #000;
  width: 100%;
  height: 100%;
  opacity: 0.8;
  z-index:9600;
}
#popup {
  position:fixed;
  width: 600px;
  height: 510px;
  background: #fff;
  left: 50%;
  top: 30%;
  border-radius: 5px;
  padding: 2px 0;
  margin-left: -320px;
  /* width/2 + padding-left */
  margin-top: -150px;
  /* height/2 + padding-top */
  text-align: center;
  box-shadow: 0 0 10px 0 #000;
z-index:96000;
}
#popup #tweet {
  color: #4099FF;
  z-index:9600;
}
#close {
  position: absolute;
  background: white;
  color: black;
  right: -15px;
  top: -15px;
  border-radius: 50%;
  width: 30px;
  height: 30px;
  line-height: 30px;
  text-align: center;
  font-size: 10px;
  font-weight: bold;
  font-family: 'Arial Black', Arial, sans-serif;
  cursor: pointer;
  box-shadow: 0 0 10px 0 #000;
  z-index:9600;
}