.rock{
  position:absolute; left:0; top:0; width:70px; height:56px; transform:translate(-50%,-55%);
}
.rock .r-shadow{
  position:absolute; left:50%; top:66%; width:82%; height:32%;
  background:rgba(0,0,0,0.28); border-radius:50%; filter:blur(2px);
  transform:translate(-50%,-50%);
}
.rock .r-blob{
  position:absolute; left:50%; top:50%;
  border-radius:46% 54% 40% 60% / 55% 45% 60% 40%;
  transform:translate(-50%,-50%);
}
.rock .r-main{
  width:100%; height:80%;
  background:radial-gradient(circle at 32% 24%, #c3c8cf, #767e88 75%);
  box-shadow: inset -6px -8px 10px rgba(0,0,0,0.18);
}
.rock .r-a{
  width:46%; height:38%; top:24%; left:36%;
  background:radial-gradient(circle at 32% 24%, #d3d7dc, #88919c 75%);
}