.cs-modal {
  display: none; 
  position: fixed; 
  z-index: 10000; 
  left: 0;
  top: 0;
  width: 100%; 
  height: 100%; 
  overflow: auto; 
  background-color: rgba(0,0,0,0.5); 
  font-family: sans-serif;
}

.cs-modal-content {
  background-color: #fefefe;
  margin: 15% auto; 
  padding: 30px;
  border: 1px solid #888;
  width: 90%;
  max-width: 500px;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 5px 15px rgba(0,0,0,0.3);
  position: relative;
}

.cs-close {
  color: #aaa;
  position: absolute;
  top: 10px;
  right: 15px;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
  line-height: 1;
}

.cs-close:hover,
.cs-close:focus {
  color: #000;
  text-decoration: none;
  cursor: pointer;
}

.cs-modal h2 {
  margin-top: 0;
  color: #333;
}