css制作超萌吃豆豆加载动画效果

<div class="demo"> <div class="pacman"></div><div class="dot"></div>

<style>@-webkit-keyframes up {  0%, 100% {    transform: rotate(0);  }  50% {    transform: rotate(-30deg);  }}@-moz-keyframes up {  0%, 100% {    transform: rotate(0);  }  50% {    transform: rotate(-30deg);  }}@-o-keyframes up {  0%, 100% {    transform: rotate(0);  }  50% {    transform: rotate(-30deg);  }}@keyframes up {  0%, 100% {    transform: rotate(0);  }  50% {    transform: rotate(-30deg);  }}@-webkit-keyframes down {  0%, 100% {    transform: rotate(0);  }  50% {    transform: rotate(30deg);  }}@-moz-keyframes down {  0%, 100% {    transform: rotate(0);  }  50% {    transform: rotate(30deg);  }}@-o-keyframes down {  0%, 100% {    transform: rotate(0);  }  50% {    transform: rotate(30deg);  }}@keyframes down {  0%, 100% {    transform: rotate(0);  }  50% {    transform: rotate(30deg);  }}@-webkit-keyframes r-to-l {  100% {    margin-left: -1px;  }}@-moz-keyframes r-to-l {  100% {    margin-left: -1px;  }}@-o-keyframes r-to-l {  100% {    margin-left: -1px;  }}@keyframes r-to-l {  100% {    margin-left: -1px;  }}body {  background: #000;  overflow: hidden;  margin: 0;}body .pacman:before, body .pacman:after {  content: '';  position: absolute;  background: #FFC107;  width: 100px;  height: 50px;  left: 50%;  top: 50%;  margin-left: -50px;  margin-top: -50px;  border-radius: 50px 50px 0 0;  -webkit-animation: up 0.4s infinite;  -moz-animation: up 0.4s infinite;  -o-animation: up 0.4s infinite;  animation: up 0.4s infinite;}body .pacman:after {  margin-top: -1px;  border-radius: 0 0 50px 50px;  -webkit-animation: down 0.4s infinite;  -moz-animation: down 0.4s infinite;  -o-animation: down 0.4s infinite;  animation: down 0.4s infinite;}body .dot {  position: absolute;  left: 50%;  top: 50%;  width: 10px;  height: 10px;  margin-top: -5px;  margin-left: 30px;  border-radius: 50%;  background: #ccc;  z-index: -1;  box-shadow: 30px 0 0 #ccc, 60px 0 0 #ccc, 90px 0 0 #ccc, 120px 0 0 #ccc, 150px 0 0 #ccc;  -webkit-animation: r-to-l 0.4s infinite;  -moz-animation: r-to-l 0.4s infinite;  -o-animation: r-to-l 0.4s infinite;  animation: r-to-l 0.4s infinite;}  </style>