accent-color

accent-color: red;

accent-color: #74992e;

accent-color: rgb(255, 255, 128);

accent-color: hsl(250, 100%, 34%);

<section class="default-example container" id="default-example">
  <div>
    <input checked="" id="example-element" type="checkbox" />
    <label for="example-element" id="example-label">Example Label</label>
  </div>
</section>

.container > div {
  display: flex;
  align-items: center;
}
#example-element {
  width: 40px;
  height: 40px;
}
#example-label {
  margin-left: 10px;
  font-size: x-large;
}

/* キーワード値 */
accent-color: auto;
/* <color> 値 */
accent-color: darkred;
accent-color: #5729e9;
accent-color: rgb(0 200 0);
accent-color: hsl(228 4% 24%);
/* グローバル値 */
accent-color: inherit;
accent-color: initial;
accent-color: revert;
accent-color: revert-layer;
accent-color: unset;

<input type="checkbox" checked />
<input type="checkbox" class="custom" checked />

input {
  accent-color: auto;
  display: block;
  width: 30px;
  height: 30px;
}
input.custom {
  accent-color: rebeccapurple;
}