And read this: https://www.w3schools.com/cssref/css3_pr_border-radius.asp

not one particular page, looking to change every image.
I might want to keep the front page main image with sharp corners.

for anyone else this is the code I used.

img{border:1px solid #;
-webkit-border-radius: 20px;
-moz-border-radius: 20px;
border-radius: 20px;
}

.home img { border-radius: 0; }