.light main {
    width: 100%;
    margin: 5px auto;
}
.light h2 {
    margin-left: 10px;
}
.light ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}
.light li {
    margin: 2px;
}
.light li a {
    display: block;
    width: 200px;
    height: 200px;
}
.light ul li img {
    display: block;
    width: 100%;
}

@media (min-width: 768px) {
    main {
        width: 768px;
    }
}