SOURCE

<div class="controls">
	<label for="toggleGuides">Toggle Guides</label>
</div>

<input type="checkbox" id="toggleGuides">

<div class="wrapper">

	<div class="angle">
		<div class="spin">
			<div class="side side-one">
				<div class="mask"></div>
				<div class="mask"></div>
			</div>
		</div>
	</div>
	
	<div class="angle">
		<div class="spin">
			<div class="side side-two">
				<div class="mask"></div>
				<div class="mask"></div>
			</div>
		</div>
	</div>
				
</div>

*,
*:before,
*:after {
  box-sizing: border-box;
}

html,
body {
  min-height: 100vh;
}

body {
  margin: 0;
  display: -webkit-box;
  display: flex;
  -webkit-box-pack: center;
          justify-content: center;
  -webkit-box-align: center;
          align-items: center;
  background: #85cdca;
  color: #368380;
  font-family: 'Helvetica', 'Arial', sans-serif;
}

.wrapper {
  width: 60vh;
  height: 60vh;
  position: relative;
  -webkit-transform-style: preserve-3d;
          transform-style: preserve-3d;
  -webkit-transform: rotateX(-15deg);
          transform: rotateX(-15deg);
}
.wrapper .angle {
  position: absolute;
  width: 100%;
  height: 100%;
}
.wrapper .angle:nth-child(1) {
  -webkit-transform: rotateY(-65deg);
          transform: rotateY(-65deg);
}
.wrapper .angle:nth-child(2) {
  -webkit-transform: rotateY(25deg);
          transform: rotateY(25deg);
}
.wrapper .angle:nth-child(2) .spin {
  animation-direction: reverse;
}
.wrapper .angle .spin {
  width: 100%;
  height: 100%;
  -webkit-animation: spin 4s linear infinite;
          animation: spin 4s linear infinite;
}
.wrapper .side {
  width: 100%;
  height: 100%;
  display: -webkit-box;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
          flex-direction: column;
  -webkit-box-align: center;
          align-items: center;
  border-radius: 100%;
  overflow: hidden;
}
.wrapper .side:before {
  content: '';
  display: block;
  width: 6vh;
  height: 6vh;
  position: absolute;
  bottom: 12vh;
  background: black;
  border-radius: 100%;
}
.wrapper .side .mask {
  width: 75%;
  height: 50%;
  position: relative;
  overflow: hidden;
}
.wrapper .side .mask:before, .wrapper .side .mask:after {
  content: '';
  display: block;
  border-radius: 100%;
}
.wrapper .side .mask:nth-child(1) {
  align-self: flex-end;
  border-radius: 50% 0 0 50% / 75% 0% 0 75%;
}
.wrapper .side .mask:nth-child(1):before {
  width: 30vh;
  height: 30vh;
  box-shadow: 0 0 0 60vh black;
  border: 12vh solid black;
}
.wrapper .side .mask:nth-child(2) {
  align-self: flex-end;
  width: 50%;
}
.wrapper .side .mask:nth-child(2):before {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-transform: translate(-50%, 0);
          transform: translate(-50%, 0);
  box-shadow: 0 0 0 60vh black;
}
.wrapper .side-two {
  -webkit-transform: scaleY(-1);
          transform: scaleY(-1);
}
.wrapper .side-two:before {
  background: white;
}
.wrapper .side-two .mask:nth-child(1):before {
  box-shadow: 0 0 0 60vh white;
  border-color: white;
}
.wrapper .side-two .mask:nth-child(2):before {
  box-shadow: 0 0 0 60vh white;
}

@-webkit-keyframes spin {
  from {
    -webkit-transform: rotate(0);
            transform: rotate(0);
  }
  to {
    -webkit-transform: rotate(-360deg);
            transform: rotate(-360deg);
  }
}

@keyframes spin {
  from {
    -webkit-transform: rotate(0);
            transform: rotate(0);
  }
  to {
    -webkit-transform: rotate(-360deg);
            transform: rotate(-360deg);
  }
}
.controls {
  position: fixed;
  bottom: 20px;
  width: 100%;
  display: -webkit-box;
  display: flex;
  -webkit-box-pack: center;
          justify-content: center;
}
.controls label {
  font-size: 12px;
  border: 2px solid #368380;
  padding: 5px 10px;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
}

#toggleGuides {
  visibility: hidden;
}

input#toggleGuides:checked ~ .wrapper .angle:nth-child(1) {
  outline: 1px solid rgba(0, 0, 0, 0.4);
}
input#toggleGuides:checked ~ .wrapper .angle:nth-child(2) {
  outline: 1px solid rgba(255, 255, 255, 0.4);
}
input#toggleGuides:checked ~ .wrapper .side-one {
  border: 1px solid rgba(0, 0, 0, 0.4);
}
input#toggleGuides:checked ~ .wrapper .side-two {
  border: 1px solid rgba(255, 255, 255, 0.4);
}