Style="text-align: justify;"

Yes, it’s possible. You probably don’t really want “all” your text justified, though.

Do you have a link to your site? And do you have a custom.css file or have you created a child theme to edit your theme?

What is NOT justified that you want? (please, be specific)

It appears that your home page paragraph is already so.

Does:

.short-content {
text-align: justify;
}

give you what you want? If not, can you clarify what text you’d like to justify?

here’s a site-wide change. It is very general and may not actually pick up specific items

html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, font, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td {
text-align:justify!important;
}

You can try it.