.popup {
    display: none; /* Hidden by default */
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5); /* Black background with opacity */
    z-index: 1000; /* Sit on top */
}
 
.popup-content {
    background-color: hsla(210,80%,70%,1);
    margin: 15% auto; /* 15% from the top and centered */
    padding: 20px;
    border: 1px solid #888;
    width: 50%; /* Could be more or less, depending on screen size */
}
 
.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}
 
.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}