Letter O

I solved it on September 30, 2022. You can try to beat my record on CSSBattle!

165 chars

<body bgcolor=926927><p style="color:6D480A;position:fixed;inset:54px 160px;border:20px solid #fff;border-radius:30px;padding:0 30;box-shadow:-20px 0,-20px 0 inset">