OcttKB/Wiki/tiddlers/$__Styles_onhover-toolbar-styles.css

.tc-tiddler-frame .tc-titlebar button {
opacity: 0;
transition: opacity .5s ease-in-out;
}
.tc-tiddler-frame:hover .tc-titlebar button {
zoom: 1;
filter: alpha(opacity=100);
opacity: 1;
}