Ghost/ghost/admin/app/styles/layouts/post-history.css

/* Modal */

.gh-post-history {
    display: flex;
    height: 100%;
}

.fullscreen-modal-post-history .modal-content {
    padding: 0;
}

/* Sidebar */

.nav-list-item .gh-post-history-version {
    margin-bottom: 2px;
}

.nav-list-item .gh-post-history-version-meta {
    color: var(--midgrey);
    font-weight: 400;
}

.nav-list-item .gh-post-history-version-current {
    margin-left: 1rem;
    padding: 0 4px;
    background: var(--lightgrey-l2);
    color: var(--darkgrey);
    font-size: 1.1rem;
    font-weight: 500;
    line-height: inherit;
    text-transform: uppercase;
    letter-spacing: .2px;
    border-radius: var(--border-radius);
}

.nav-list-item .gh-post-history-version-wordcount {
    color: var(--green-d1);
    margin-left: auto;
}

.nav-list-item .gh-post-history-version-wordcount .subtracted {
    color: var(--red-d1);
    margin-left: .8rem;
}


/* Main content */

.gh-post-history-main {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: auto;
}

.gh-post-history .gh-editor-title {
    height: initial;
    max-width: 740px;
    margin-left: auto;
    margin-right: auto;
    color: rgba(21, 23, 26, 0.4);
}

.gh-post-history-main .koenig-lexical p {
    color: rgba(21, 23, 26, 0.4);
}

.gh-post-history-main .koenig-lexical del {
    color: var(--red) !important;
}