html
  body
    .flag
      .saffron
      .white
        .wheel
          .wheel-center
          - var n = 24
          while n --> 0
            .spoke
      .green

// navy blue
@blue: #000080;

// india saffron 
@saffron: #ff9933;

// india green
@green: #138808;

// pure white
@white: #ffffff;

* {
  box-sizing: border-box;
}

// mixin to center children using flex
// The parentheses at the end are optional, because the mixin does not
// take any arguments. But it's a good practice to use the parentheses
// always, so that we can tell at a glance that this is a mixin and not 
// a class.
.center-elements () {
  display: flex;
  align-items: center;
  justify-content: center;
}

body {
  background: #1d1e22;
  width: 100%;
  height: 100vh;
  .center-elements();
}

.flag {
  width: 675px;
  height: 450px;
}

.saffron, .white, .green {
  width: 100%;
  height: 150px;
}

.saffron {
  background: @saffron;
}

.green {
  background: @green;
}

.white {
  background: @white;
  padding: 15px;
  .center-elements();
}

.wheel {
  position: relative;
  width: 120px;
  height: 120px;
  
  border-radius: 50%;
  border: 4px @blue solid;
  
  overflow: hidden;
  .center-elements();
}

.wheel-center {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: @blue;
}

.spoke {
  position: absolute;
  left: 56px;
  top: 56px;
  
  width: 31px;
  height: 4px;
  background: @blue;
  
  transform-origin: 0 0;
  
  &:after {
    content: ' ';
    position: absolute;
    top: 2px;
    left: -25px;
    
    display: block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: @blue;
    
    transform: skew(-84deg)translate(1px,3px);
  }
}

// recursive mixin to generate the nth-of-type rulesets for spokes
// terminate when the value of @n reaches 26
.gen-spokes (@n) when (@n = 26) {}

// when value of @n is less than 26, generate the ruleset for the nth
// spoke and then apply self with the next value (@n + 1)
.gen-spokes (@n) when (@n < 26) {
  @selector: ~".spoke:nth-of-type(@{n})";
  @{selector} {
    transform: rotateZ(@n * 15deg)skew(84deg);
  }
  @next: (@n+1);
  .gen-spokes(@next);
}

.gen-spokes(1);