自定义复选框居中

<label class="custom-checkbox">
  <input type="checkbox">
  <span class="checkmark"></span>
  文本内容
</label>

.custom-checkbox {
  display: flex;
  align-items: center;
  cursor: pointer;
}

.custom-checkbox input {
  position: absolute;
  opacity: 0;
  cursor: pointer;
}

.checkmark {
  position: relative;
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 1px solid #ccc;
  border-radius: 3px;
  margin-right: 10px;
}

.custom-checkbox input:checked ~ .checkmark {
  background-color: #2196F3;
}

.custom-checkbox input:checked ~ .checkmark:after {
  content: "";
  position: absolute;
  display: none;
}

.custom-checkbox input:checked ~ .checkmark:after {
  display: block;
}

.custom-checkbox .checkmark:after {
  left: 7px;
  top: 3px;
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}