.nav {
    float: right;
    font-size: 24px;
    padding-left: 32px;
}

td {
    width: 25%;
}

.tn {
    max-width: 100%;
    max-height: 100%;
}

#big {
    height: 960px;
    display: none;
    background-size: auto 100%;
    background-repeat: no-repeat;
    background-position: center;
}

#close {
    width: 64px;
    height: 64px;
    top: 0px;
    position: relative;
    float: right;
    background-image: url("../img/close.png");
    background-repeat: no-repeat;
    background-position: center;
}