mybuddy/core/static_src/scss/core.scss

#view-core\:child {
    .child-photo {
        max-width: 150px;
    }
}

@include media-breakpoint-up(md) {
    #view-core\:child {
        .child-detail-column {
            position: fixed;
            width: 100%;
        }
    }
}