Each line of buttons is wrapped in a table so theme_advanced_buttons1
is inside a table, theme_advanced_buttons2
is inside another table and theme_advanced_buttons3
is inside another one, so to make them inline you can use
.wp_themeSkin table.mceToolbar {
margin: 0 6px 2px; // this is by default
display: inline-table; // this is extra I've added to keep them in single line
}
Below is a screenshot of display: inline-table;
in full screen mode of the editor, all three lines of buttons are in one line, side by side
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