.main {
    display: flex;
    background: #f00;
}

.main-social {
    overflow: auto;
    flex-grow: 1;
    background: #f44;
}

.main div {
    padding: 2%;
}

.main #photos {
    flex: 1;
    align-self: flex-start;
    position: sticky;
    top: 0;
    background: #eee;
}

.main #bio {
    flex: 2;
    background: #bbb;
}

#photos img {
    width: 25%;
    border-color: #ddd;
    border-width: 1vw;
    border-style: solid;
    border-radius: 10%;
    filter: grayscale(1);
    transition: filter 1s;
}

#photos img:hover {
    filter: none;
}