body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f0f0;
}
h1 {
    text-align: center;
}
h2 {
    text-align: center;
}
p {
    text-align: center;
}
a {
    display: block;
    text-align: center;
    margin: 10px;
}
ul {
    text-align: center;
    list-style-type: none;
    padding: 0;
    margin: 0;
}
li {
    margin: 10px;
}
img {
    align-items: center;
}
.preview {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}