.tox.tox-tinymce {
    border-radius: unset;
    border: 1px solid #ccc;
}

    .tox.tox-tinymce .tox-menubar + .tox-toolbar-overlord {
        border-top: 1px solid #ccc;
        border-bottom: 1px solid #ccc;
        padding-top: 0;
        padding-bottom: 0;
    }

.tox:not(.tox-tinymce-inline).tox-tinymce .tox-editor-header {
    box-shadow: none;
}

.tox:not([dir=rtl]).tox-tinymce .tox-toolbar__group:not(:last-of-type) {
    border-right: 1px solid #ccc;
}