element-ui show-overflow-tooltip修改边框颜色

<template>
  <div class="box">

    <div class="table">
      <h1>222</h1>
      <h1>222</h1>
      <h1>222</h1>
      <h1>222</h1>
      <h1>222</h1>
      <h1>222</h1>
      <h1>222</h1>

      <el-table ref='multipleTable' :data="tableData" tooltip-effect="light">
        <el-table-column type="selection" width="50" align="center" />
        <el-table-column prop="subject" label="标题" align="left" header-align="center" show-overflow-tooltip>
          <template slot-scope="scope">
            <div style="display:flex;line-height:15px">
              <p v-if="scope.row.isread == 1" style="overflow: hidden;white-space: nowrap;text-overflow: ellipsis;color:#888">{{scope.row.subject}}</p>
              <p v-if="scope.row.isread != 1" style="overflow: hidden;white-space: nowrap;text-overflow: ellipsis;color:#333333">{{scope.row.subject}}</p>
              <p>
                <span v-if="scope.row.isurging == 1" style="padding-left: 3px;">
                  <button class="cbBtn">催办</button>
                </span>
                <span v-if="scope.row.iscommunicate == 1" style="padding-left: 3px;">
                  <button class="cyBtn">传阅</button>
                </span>
              </p>
            </div>

          </template>
        </el-table-column>
      </el-table>

    </div>

  </div>
</template>

<script>
export default {
  data () {
    return {
      tableData: [
        {
          subject: '众里寻他千百度，蓦然回首，那人却在，灯火阑珊处众里寻他千百度，蓦然回首灯火阑珊处众里寻他千百度，蓦然回首灯火阑珊处众里寻他千百度，蓦然回首，那人却在，灯火阑珊处众里寻他千百度，蓦然回首，那人却在，灯火阑珊处众里寻他千百度，蓦然回首',
          isurging: 1
        },
        {
          subject: '众里寻他千百度，蓦然回首，那人却在，灯火阑珊处众里寻他千百度，蓦然回首，那人却在，灯火阑珊处众里寻他千百度，蓦然回首，那人却在，灯火阑珊处众里寻他千百度，蓦然回首',
          iscommunicate: 1
        }
      ]
    }
  }
}
</script>
<style lang="less">
.custom-table-row {
  height: 20px !important;
}
.el-tooltip__popper.is-light {
  color: #1890ff;
  border: 1px solid #1890ff !important;
  background: rgb(255, 255, 255) !important;
  &::before {
    position: absolute;
    bottom: -5px;
    left: calc(50% - 17px);
    overflow: hidden;
    width: 8px;
    height: 8px;
    background: #fff;
    border-left: 1px solid #1890ff;
    border-top: 1px solid #1890ff;
    -webkit-transform: rotate(225deg);
    -moz-transform: rotate(225deg);
    -o-transform: rotate(225deg);
    transform: rotate(225deg);
    content: '';
  }
}

.el-tooltip__popper.is-light {
  &[x-placement^='top'] .popper__arrow:after {
    // border-top-color: skyblue;
    display: none;
  }

  &[x-placement^='top'] .popper__arrow {
    // border-top-color: red;
    display: none;
  }
}
.cbBtn {
  border-radius: 4px;
  background: #f86f6f;
  color: #fff;
  border: none;
  padding: 0px 5px;
}
.cyBtn {
  border-radius: 4px;
  background: #ff9512;
  color: #fff;
  border: none;
  padding: 0px 5px;
}
</style>