libreoffice-online/loleaflet/css/btns.css

.loleaflet-annotation-edit #annotation-cancel,
.ui-button-box #cancel,
.cell.jsdialog > button:not(#ok),
.ui-button-box.jsdialog button:not(#ok) {
	height: 32px;
	line-height: 0em;
	color: #222;
	min-width: 62px;
	background-color: #f1f1f1;
	border: 1px solid #ccc;
	border-radius: 3px;
	margin: 5px;
}

.loleaflet-annotation-edit #annotation-save,
#annotation-reply,
.ui-button-box #ok,
.cell.jsdialog > button,
.ui-button-box.jsdialog button {
	height: 32px;
	line-height: 0em;
	color: #111;
	min-width: 62px;
	background-color: #f4f4f4;
	border: 1px solid #777;
	border-radius: 3px;
	margin: 5px;
}