This is a CSS rule that applies styles to certain...

This is a CSS rule that applies styles to certain HTML elements when they are hovered over. Let's break it down step by step:

1. Selector:

   • :is(#comp-mea6tr2k_r_comp-mb5540nm5, [id^="comp-mea6tr2k_r_comp-mb5540nm5__"]):
     • The :is() pseudo-class simplifies complex selectors. It matches any element that fits one of the selectors inside it.
     • #comp-mea6tr2k_r_comp-mb5540nm5: Matches an element with the specific id of comp-mea6tr2k_r_comp-mb5540nm5.
     • [id^="comp-mea6tr2k_r_comp-mb5540nm5__"]: Matches any element whose id begins with comp-mea6tr2k_r_comp-mb5540nm5__.
   • Combined, it targets elements that either match the first ID or have an id starting with the given prefix.

   After the first selector, there's a descendant selector:

   • .comp-mea6tr2k_r_comp-mb5540nm5-styleId__root:hover: Targets child elements with the class comp-mea6tr2k_r_comp-mb5540nm5-styleId__root when they are hovered over.

2. Styles (applied on hover):

   • border-radius: 8px;: Rounds the corners of the element with a radius of 8 pixels.
   • border: 0px solid #000000;: Removes the border by setting it to 0px width.
   • background: rgb(255, 255, 255);: Sets the background color of the element to white.

Summary: This rule applies specific styles (rounded corners, no border, a white background) to child elements with the class .comp-mea6tr2k_r_comp-mb5540nm5-styleId__root when they are hovered over, but only if the parent element has a specific id or an id starting with a given prefix.