.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);
}