基于this个答案,下面是:
body {
display: flex;
justify-content: center;
align-items: center;
background: #433f3f;
}
.pacman {
width: 495px;
height: 495px;
background: #d9d9d9;
clip-path: polygon(0% 0%, 0% 100%, 100% 100%, 100% 50%, 50% 50%, 85.5% 0%);
border-radius: 50%;
}
<div class="pacman"></div>