body {
    font-family: Arial, sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 2em;
    line-height: 1.6;
}
header {
    text-align: center;
    margin-bottom: 2em;
}
.content h1, .content h2, .content h3 {
    margin-top: 1.2em;
}
a {
    color: #0645ad;
}

.avatar {
    display: block;
    margin: 0 auto 1em;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
}