Hello Divakar,
The width of the column where the text and photos are contained in single post and single page templates is controlled by a Bootstrap-based grid. Here is what you can do to make it wider:
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A little disclaimer: It’s best to do such modifications in a child theme, so they do not get overwritten during theme updates. However, of course you can always re-introduce modifications after a theme update.
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Go to single.php file located in theme folder, go to line 25 (might slightly differ depending on the version of the theme), and replace this line:
<div class="col-md-8 col-md-offset-2">
with this:
<div class="col-md-10 col-md-offset-1">
If you wish to also increase the width of the column in page templates, please go to page.php file located in theme folder, go to line 24, and replace this line:
<div class="col-md-8 col-md-offset-2">
with this
<div class="col-md-10 col-md-offset-1">
Regards,
Paul