Ghost/ghost/admin/app/styles/layouts/members.css

.view-actions input.gh-members-list-searchfield {
    min-width: 220px;
    padding-left: 30px;
}

p.gh-members-list-email {
    margin: -2px 0 -1px;
}

.gh-members-list-subscribed-at {
    margin-right: -8px;
    padding-right: 0;
}

.gh-members-placeholder {
    width: 118px;
    margin: -30px 0 15px;
}