style.css

h1 {
    text-align: center;
}

table {
    margin: 0 auto;
}

td {
    background-color: navy;
    height: 50px;
    width: 50px;
}

img {
    width: 500px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

p {
    padding-top: 10px;
    text-align: center;
}

button {
    margin: 5px;
}

div#popUpDiv {
    background-color: red;
    width: 200px;
    height: 200px;
    z-index: 10;
    margin-left: auto;
    margin-right: auto;
    position: absolute;
    top: 10px;
    right: 10px;
}

div#imageContainer {
    position: relative;
    width: 500px;
    margin-left: auto;
    margin-right: auto;
}

div#closeButtonDiv {
    background-color: white;
    position: absolute;
    top: 0px;
    right: 0px;
    float: right;
    margin-right: 0px;
    border: 1px solid black;
}