默认的展示

美化后的展示

实现方式

利用伪类创建一个好看的样式，再利用定位将其遮盖

/* 代办事项 */
#content input {
  position: relative;
  top: 1px;
}
#content input[type="checkbox"] {
  position: relative;
  width: 14px;
  height: 14px;
  font-size: 14px;
  left: -20px;
  margin-right: -16px;
}
#content input[type="checkbox"]::after {
  border-radius: 3px;
  position: absolute;
  top: 0;
  background-color: white;
  color: #000;
  width: 15px;
  height: 15px;
  display: inline-block;
  visibility: visible;
  padding-left: 0;
  text-align: center;
  content: " ";
  box-sizing: border-box;
  border: 1px solid #ccc;
}
#content input[type="checkbox"]:checked::before {
  content: "✓";
  font-size: 12px;
  font-weight: bold;
  color: #7459ee;
  position: absolute;
  display: inline-block;
  z-index: 10;
  top: -1px;
  left: 3px;
}