How to change font-size for all posts. pages, plugins

How do I change the standard font-size from 15px to 18px for the whole wordpress page.
body {     margin: 0;     font-family: "Roboto", sans-serif;     font-size: 18px;... is not enough. 
Thanks in advance


  • Hello 
    For this add the below css code inside the custom css box . 

    .blog_section2 p, .blog_single_post p {
        font-size: 18px ! important;

    Let us know for further assistance . 
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