style.css

body {
    max-width: 650px;
    margin: 40px auto;
    padding: 0 10px;
    font: 18px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    color: #444;
}
h1, h2, h3 {
    line-height: 1.2;
    clear: both;
}
.icon {
    font-size: 1rem;
    color: #aaa;
}
ul.team {
    text-align: center;
    list-style-type: none;
    padding-left: 0;
    padding-right: 0;
}
ul.team li p {
    margin-bottom: 0;
    margin-top: 0;
}
ul.team li p:last-child {
    margin-bottom: 1rem;
}
ul.team li {
    float: left;
    width: 33%;
}
a.icon, a.icon:hover, a.icon:focus, 
.icon a, .icon:hover a, .icon:focus a,
a i.link-icon, a:hover i.link-icon, a:focus i.link-icon {
    text-decoration: none;
    box-shadow: none;
}
a.icon:hover, a.icon:focus {
    color: #212529;
}
.icon span {
    display: none;
}
.avatar {
    width: 100px;
    height: 100px;
    background-color: #FFF;
    padding: 0.3rem;
    border: 2px solid #DDD;
    border-radius: 50%;
}
.illustration {
    display: block;
    width: 50%;
    margin-left: auto;
    margin-right: auto;
}
@media (prefers-color-scheme: dark) {
    body {
        color: #c9d1d9;
        background: #0d1117;
    }
    a:link {
        color: #58a6ff;
    }
    a:visited {
        color: #8e96f0;
    }
    .illustration {
        filter: invert(1);
    }
    .avatar {
        background-color: #111;
        border-color: #333;
    }
    a.icon:link, a.icon:visited{
        color: #979797;
    }
    a.icon:hover, a.icon:focus {
        color: #cecece;
    }
}