Hi i need to fix 4 errors from validator.
Link
https://validator.w3.org/nu/?showsource=yes&doc=https%3A%2F%2Fjapservice.gr%2Fel%2F%25CF%258C%25CF%2581%25CE%25BF%25CE%25B9-%25CF%2587%25CF%2581%25CE%25AE%25CF%2583%25CE%25B7%25CF%2582.html
Errors
Error: CSS: width: device-width is not a width value.
From line 253, column 34; to line 253, column 45
{ width: device-width; }↩
Error: The itemprop attribute was specified, but the element is not a property of any item.
From line 2431, column 2; to line 2431, column 45
m-page">↩ <meta itemprop="inLanguage" content="el-GR">↩ ↩
Error: The itemprop attribute was specified, but the element is not a property of any item.
From line 2447, column 6; to line 2447, column 29
er">↩ <h2 itemprop="headline">↩ Ό
Error: The itemprop attribute was specified, but the element is not a property of any item.
From line 2455, column 2; to line 2455, column 63
</div>↩ ↩ <div itemprop="articleBody" class="com-content-article__body">↩ <