#calendar {
    max-width: 900px;
    margin: 0 auto;
    height: 500px;
}

/*#custom-form{
    margin-top:500px
}*/

#popup{
    display:none;
    margin-top:450px;
    z-index:1000;
    position:absolute;
    margin-left: 30%;
    background-color:white;
    color:black;
    padding: 30px;
    border-radius: 15px; /* Rounded corners */
    box-shadow: 0px 10px 20px rgba(0, 0, 0, 0.2);
}