Trilium/apps/client/src/widgets/note_title.css

.note-title-widget {
    flex-grow: 1000;
    height: 100%;
}

.note-title-widget input.note-title {
    font-size: 110%;
    border: 0;
    margin: 2px 0px;
    min-width: 5em;
    width: 100%;
    padding: 1px 12px;
}

.note-title-widget input.note-title.protected {
    text-shadow: 4px 4px 4px var(--muted-text-color);
}

body.mobile .note-title-widget input.note-title {
    padding: 0;
}

body.desktop .note-title-widget input.note-title {
    font-size: 180%;
}