<div class="avatar"><img src="https://via.placeholder.com/250" alt=""></div>

body {
  margin: 50px;
}

.avatar {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border-bottom-left-radius: 4px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.avatar:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border-bottom-left-radius: 6px;
  box-shadow: inset 0 0 0 10px rgba(255, 255, 255, 0.5);
}