#user-alert-box {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 90%;
  background-color: #333;
  color: #fff;
  padding: 15px;
  box-sizing: border-box;
  display: none;
  flex-direction: column;
  align-items: center;
  z-index: 9999;
  margin: 10px;
}
#user-alert-box a {
  color: #1e90ff;
  text-decoration: none;
}
#user-alert-box .button {
  margin-top: 10px;
}
#user-alert-box button {
  background-color: #155799;
  color: #fff;
  border: none;
  padding: 10px 20px;
  cursor: pointer;
}
@media(min-width: 768px) {
  #user-alert-box {
    flex-direction: row;
    justify-content: space-between;
    max-width: 600px;
  }
}