Modifying or hiding close buttons on invitations

The close button on an invitation can be modified to another color, size, or position in the CSS file, as follows:

.xDix {
top: 15px !important; /* move down */
right: 21px !important; /* move left */
color: #5081ff !important' /*change color*/
font-size: 26px !important;
cursor: pointer;
background: red !important; /* change background color */
}