Sure!
You would just want to target this element like so:
html .background-container {
position: fixed;
top: 0;
left: 0;
height: 100vh;
width: 100vw;
background: url(https://d11a6trkgmumsb.cloudfront.net/original/3X/8/3/8352b68….jpeg);
background-size: cover;
/* background: linear-gradient(90deg, var(--tertiary-hover) 0%, var(--tertiary) 100%); */
clip-path: ellipse(148% 70% at 91% -14%);
Here is how that looked locally when editing through Chrome’s inspector.