css画个半圆

<div style="width: 50px;
height: 100px;
border: 1px solid black;
border-radius: 100% 0 0 100%/50%;
border-right: none;"></div>

然后加点细节

<div class="spinner">
  <div class="double-bounce1"></div>
  <div class="double-bounce2"></div>
</div>


.spinner {
  width: 60px;
  height: 60px;
 
  position: relative;
  margin: 100px auto;
}
 
.double-bounce1, .double-bounce2 {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: #67CF22;
  opacity: 0.6;
  position: absolute;
  top: 0;
  left: 0;
   
  -webkit-animation: bounce 2.0s infinite ease-in-out;
  animation: bounce 2.0s infinite ease-in-out;
}
 
.double-bounce2 {
  -webkit-animation-delay: -1.0s;
  animation-delay: -1.0s;
}
 
@-webkit-keyframes bounce {
  0%, 100% { -webkit-transform: scale(0.0) }
  50% { -webkit-transform: scale(1.0) }
}
 
@keyframes bounce {
  0%, 100% {
    transform: scale(0.0);
    -webkit-transform: scale(0.0);
  } 50% {
    transform: scale(1.0);
    -webkit-transform: scale(1.0);
  }
}

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