Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.12)
// Compass (v1.0.3)
// ----

//定义大圆的直径
$large-r: 460px !default;
//定义小圆的直径
$small-r: 30px !default;

//动画时间
$time: 3s;
$delay: $time/8;

//定义角度
$angle: 360deg/16;

*{
  margin: 0;
  padding: 0;
}
body {
  line-height: 1.5;
}
label {
  cursor: pointer;
  margin-right: 10px;
}
input, label {
  vertical-align: middle;
  font-size: 22px;
}
.main {
  text-align: center;
}

.circle {
  margin: 20px auto;
  position: relative;
  background: black;
  border-radius: 50%;
  height: $large-r;
  width: $large-r;
    & .line {
      height: 100%;
      position: absolute;
      width: 1px;
      left: 50%;
      background-color: transparent;
      transition: background-color .3s;
        &:before {
          content: '';
          position: absolute;
          width: $small-r;
          height: $small-r;
          line-height: $small-r;
          left: -$small-r/2;
          text-align: center;
          background: #2695E3;
          color: #fff;
          border-radius: 50%;
    }
  }
}
.circle .line:before {
  -webkit-animation: move $time ease-in-out infinite alternate;
}
@for $i from 1 through 8 {
.circle .line:nth-child(#{$i}){
  transform: rotate($angle * $i);
    &:before{
      -webkit-animation-delay: ($i - 1) * $delay;
      transform: rotate(-$angle * $i);
    }
}
}

@-webkit-keyframes move {
  from {
    top: 0;
  }
  to {
    top: $large-r - $small-r;
  }
}

#track:checked ~ .circle .line {
  background-color: #81E586;
}

#play:checked ~ .circle .line:before {
  -webkit-animation-play-state: paused;
}

/* 显示编号 */
#number:checked ~ .circle .line:before {
  content: attr(data-id);
}


/* 暂停 */
#play ~ label:after {
  font-size: 50px;
  display: inline-block;
  vertical-align: middle;
  content: "🙈";
}

/* 播放 */
#play:checked ~ label:after {
  content: "🙉么";
}
// $pi: 3.141592653589793 !default;



// @for $i from 1 through 4 {
//   .main .line:nth-child(#{$i}):before{
//     top: $r - (cos((5 - $i )*$pi/8)*$r);
//     // transform: translate(-50%, $r - (cos((5 - $i )*$pi/8)*$r));
//   }
// }

// @for $i from 5 through 8 {
//   .main .line:nth-child(#{$i}):before{
//     top: $r - (cos((5 - $i )*$pi/8)*$r);
//     // transform: translate(-50%, $r - (cos((5 - $i )*$pi/8)*$r));
//   }
// }

SassMeister-output.css

@charset "UTF-8";
* {
  margin: 0;
  padding: 0;
}

body {
  line-height: 1.5;
}

label {
  cursor: pointer;
  margin-right: 10px;
}

input, label {
  vertical-align: middle;
  font-size: 22px;
}

.main {
  text-align: center;
}

.circle {
  margin: 20px auto;
  position: relative;
  background: black;
  border-radius: 50%;
  height: 460px;
  width: 460px;
}
.circle .line {
  height: 100%;
  position: absolute;
  width: 1px;
  left: 50%;
  background-color: transparent;
  transition: background-color .3s;
}
.circle .line:before {
  content: '';
  position: absolute;
  width: 30px;
  height: 30px;
  line-height: 30px;
  left: -15px;
  text-align: center;
  background: #2695E3;
  color: #fff;
  border-radius: 50%;
}

.circle .line:before {
  -webkit-animation: move 3s ease-in-out infinite alternate;
}

.circle .line:nth-child(1) {
  transform: rotate(22.5deg);
}
.circle .line:nth-child(1):before {
  -webkit-animation-delay: 0s;
  transform: rotate(-22.5deg);
}

.circle .line:nth-child(2) {
  transform: rotate(45deg);
}
.circle .line:nth-child(2):before {
  -webkit-animation-delay: 0.375s;
  transform: rotate(-45deg);
}

.circle .line:nth-child(3) {
  transform: rotate(67.5deg);
}
.circle .line:nth-child(3):before {
  -webkit-animation-delay: 0.75s;
  transform: rotate(-67.5deg);
}

.circle .line:nth-child(4) {
  transform: rotate(90deg);
}
.circle .line:nth-child(4):before {
  -webkit-animation-delay: 1.125s;
  transform: rotate(-90deg);
}

.circle .line:nth-child(5) {
  transform: rotate(112.5deg);
}
.circle .line:nth-child(5):before {
  -webkit-animation-delay: 1.5s;
  transform: rotate(-112.5deg);
}

.circle .line:nth-child(6) {
  transform: rotate(135deg);
}
.circle .line:nth-child(6):before {
  -webkit-animation-delay: 1.875s;
  transform: rotate(-135deg);
}

.circle .line:nth-child(7) {
  transform: rotate(157.5deg);
}
.circle .line:nth-child(7):before {
  -webkit-animation-delay: 2.25s;
  transform: rotate(-157.5deg);
}

.circle .line:nth-child(8) {
  transform: rotate(180deg);
}
.circle .line:nth-child(8):before {
  -webkit-animation-delay: 2.625s;
  transform: rotate(-180deg);
}

@-webkit-keyframes move {
  from {
    top: 0;
  }
  to {
    top: 430px;
  }
}
#track:checked ~ .circle .line {
  background-color: #81E586;
}

#play:checked ~ .circle .line:before {
  -webkit-animation-play-state: paused;
}

/* 显示编号 */
#number:checked ~ .circle .line:before {
  content: attr(data-id);
}

/* 暂停 */
#play ~ label:after {
  font-size: 50px;
  display: inline-block;
  vertical-align: middle;
  content: "🙈";
}

/* 播放 */
#play:checked ~ label:after {
  content: "🙉么";
}