1) For article headings, add this at end of
template.css file::
.contentheading a.contentpagetitle{font-weight:bold;color:#000;}
and change color code accordingly
2) For tabshow module content, You can update properties here accordingly::
#s5_button_content .moduletable {style.css(108)
font-size: 0.85em;
padding: 12px 0 0 2px;
}
Css file reference:: templates/life_journey/html/mod_s5_tabshow/s5_tabshow/styles.css