使用纯css3在圆圈(图标)内勾选/勾选

<label class="checkbox">
  <input type="checkbox">
  <span class="checkmark"></span>
</label>

.checkbox input {
  display: none;
}

.checkbox .checkmark {
  position: relative;
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid #ccc;
  border-radius: 50%;
}

.checkbox .checkmark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: #ccc;
  opacity: 0;
}

.checkbox input:checked + .checkmark::after {
  opacity: 1;
}