How do I give the thumbnails on my homepage rounded corners?

Site URL: http://www.evieliu.com/

I tried using this code, but it doesn't work. What should I do?

#block-[58dc338d5016e1b665cb576f]
img{
    border-radius:10%;
}

Use this CSS

.homepage .index-section {
    border-radius: 20px;
}

Hello! Does this actually apply to the front page of my website? I'm trying to round the corners using an existing template, and it doesn't seem to work. 

Would appreciate any help!

On 3/3/2021 at 8:32 AM, ShaunPendy said:

Hello! Does this actually apply to the front page of my website? I'm trying to round the corners using an existing template, and it doesn't seem to work. 

 

Would appreciate any help!

 

 

Can you share link to your site? WE can check code easier