如何从其他网页更改REQUEST的样式？

As you can see in the picture, there is the definition of the word HELLO from the site wordreference.com .

I desire urgently to eliminate objects i desired, for example the search bar, while maitaing the main definition. I also must be able to change the fontstyle, color, size, etc. of all of the text in wordreference's anwser. (...)

    echo "<iframe id='first' src='http://api.wordreference.com/definition/{$word}' 
          frameborder='0' 
          width='400px' 
          height='300px' 
          scrolling='yes'
          textcolor='red'
          border-style: none;></iframe>";

    ?>   
</body>

They have an API specifically for this. You are using it incorrectly.

Check there API Docs and http://api.wordreference.com/1/json/enfr/grin

Parse the JSON response before you echo any HTML code.