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.modal {
    /* some styles to position the modal at the center of the page */
    position: fixed;
    top: 50%;
    left: 50%;
    width: 300px;
    line-height: 200px;
    height: 200px;
    margin-left: -150px;
    margin-top: -100px;
    background-color: #f1c40f;
    text-align: center;
   
    /* needed styles for the overlay */
    z-index: 10; /* keep on top of other elements on the page */
    outline: 9999px solid rgba(0,0,0,0.5);
}