JSFiddle - React, Tailwind, and code Playground

HTML

<div style="padding-top:5px;">
    
    <div class="right">line 1</div>
    <div class="right">line 2</div>
    <div class="right">
        <img class="img-thumbnail" src="https://upload.wikimedia.org/wikipedia/ro/f/f7/Stack_Overflow_logo.png"></img>
    </div>
    <div class="right">line 4</div>
    <div class="right">
        <img class="img-thumbnail" src="https://upload.wikimedia.org/wikipedia/ro/f/f7/Stack_Overflow_logo.png"></img>
    </div>
    <div class="right">line 6</div>    
</div>

CSS

.right {
    background-color: red;
}

JavaScript

$("img.img-thumbnail").parents('div.right').css("background-color", "green");