Power Apps Portals :

If you want to apply CSS Styles to Entity lists in Power Apps Portal website follow the Below Steps:

Power Apps Portals

Step 1:Navigate Default studio “Web Template”.

Step 2:Paste the below code in your Web Template of the Web Page ,where you have placed the Entity List.

<style>
.entitylist
{
padding:30px;
border-radius:20px;
}
.view-gridtable {
font-family:Arial, Helvetica, sans-serif;
border-collapse:collapse;
width:100%;
}
.view-grid table td, table th {
border:1pxsolid#ddd;
padding:8px;
}
.view-grid table tr:nth-child(even){background-color: #f2f2f2;}
.view-grid table tr:hover {background-color: #ddd;}
.view-grid table th,.view-grid table th a {
padding-top:8px;
padding-bottom:8px;
text-align:left;
background-color:#7a2211;
color:white;
}
</style>

Now save and sync configuration and reload the Portal  page. You will see the List  like the below page.

 

 

Hope this helpful!