How to change size of right side bar

Software Support
1

I need to reduce right side bar (Block with information For Readers and For Authors etc.). I need it in article details page.
How can i do it efficiently? OJS 3.1.1.4

2

Made changes in files “plugins/themes/default/styles/objects/article_details.less”, “plugins/themes/default/styles/body.less”:

.main_entry{width: 70%;}
.entry_details{width: 30%;}
.pkp_structure_sidebar {width: 20%;}
.pkp_structure_main {width: 80%;}
.pkp_structure_main::after{left: 80%;}

(in appropriate places)

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