AdminLTE/build/scss/plugins/_icheck-bootstrap.scss

/*
 * Plugin: iCheck Bootstrap
 * ------------------------
 */

// iCheck colors (theme colors)
@each $name, $color in $theme-colors {
  .icheck-#{$name} > input:first-child:not(:checked):not(:disabled):hover + label::before,
  .icheck-#{$name} > input:first-child:not(:checked):not(:disabled):hover + input[type="hidden"] + label::before {
      border-color: #{$color};
  }

  .icheck-#{$name} > input:first-child:checked + label::before,
  .icheck-#{$name} > input:first-child:checked + input[type="hidden"] + label::before {
      background-color: #{$color};
      border-color: #{$color};
  }
}

// iCheck colors (colors)
@each $name, $color in $colors {
  .icheck-#{$name} > input:first-child:not(:checked):not(:disabled):hover + label::before,
  .icheck-#{$name} > input:first-child:not(:checked):not(:disabled):hover + input[type="hidden"] + label::before {
      border-color: #{$color};
  }

  .icheck-#{$name} > input:first-child:checked + label::before,
  .icheck-#{$name} > input:first-child:checked + input[type="hidden"] + label::before {
      background-color: #{$color};
      border-color: #{$color};
  }
}