SOURCE

<div class="group">
  <span class="a1">1</span>
  <span class="a2">2</span>
  <span class="a3">3</span>
  <span class="a4">4</span>
</div>

<div class="el-form-item__content">
  <div class="el-checkbox-group">
    <label class="el-checkbox">
      <span class="el-checkbox__input">
        <span class="el-checkbox__inner">
        </span>
        <input type="checkbox" class="el-checkbox__original" />
      </span>
      <span class="el-checkbox__label">
        Option
      </span>
    </label>
    <label class="el-checkbox">
      <span class="el-checkbox__input">
        <span class="el-checkbox__inner">
        </span>
        <input type="checkbox" class="el-checkbox__original" />
      </span>
      <span class="el-checkbox__label">
        Option2
      </span>
    </label>
  </div>  
</div>

* {
  margin: 0;
  padding: 0;
}

.group {
  /* font-size: 0; */
  /* letter-spacing: -6px; */
}

.a1, .a2, .a3, .a4 {
  display: inline-block;
  width: 33.3333%;
  background-color: #333;
  margin: 10px 0;
  color: white;
  line-height: 32px;
  text-align: center;
}

.el-checkbox-group {
  /* font-size: 0; */
}

.el-checkbox {
    color: #606266;
    font-weight: 500;
    font-size: 14px;
    user-select: none;
    margin-right: 30px;
}

.el-form-item__content {
    background-color: #999;
    line-height: 40px;
    position: relative;
    font-size: 14px;
}

.el-checkbox__input {
    outline: 0;
    line-height: 1;
    vertical-align: middle;
}

.el-checkbox__label {
    display: inline-block;
    padding-left: 10px;
    line-height: 20px;
    font-size: 14px;
}