img {
    width: 100%;
    max-width: 100%;
    display: block;
    margin: 50px auto;
}
#bold-list {
    font-weight: bold;
}
ul {
    list-style: none;
    text-align: center;
    margin: 100px auto;
}
ul li {
 margin: 30px auto;
}

@media only screen and (orientation: portrait) {
    ul {
        margin: 100px 7%;
        text-align: justify;
    }
}