Please try with my following suggestion:
+ With com_content
Open templates/ja_zite/css/template.css file
from
h2.contentheading, .contentheading {
font-weight: normal;
color: #333333
font-family: 'NovecentowideUltraLightBold';
font-size: 300%;
line-height: 1.1;
}
change to
h2.contentheading, .contentheading {
font-weight: normal;
color: #333333
font-family: 'NovecentowideUltraLightBold';
font-size: 300%;
line-height: 1.1;
text-align: center;
}
+ With k2 component
Open templates/ja_zite/css/k2.css file
from
div.itemHeader h2.itemTitle {
color: #333
font-family: 'NovecentowideUltraLightBold';
font-size: 300%;
padding: 0;
margin: 0 0 10px;
}
Change to
div.itemHeader h2.itemTitle {
color: #333
font-family: 'NovecentowideUltraLightBold';
font-size: 300%;
padding: 0;
margin: 0 0 10px;
text-align: center;
}
Remember to clear cache from Admin area