项目用到element-plus Dropdown组件，但是组件默认样式有点不太符合项目要求，本来以为很简单就修改，结果摆弄了一天才修改完，主要是找不到各种样式的元素标签，有方法的大神可以指导一下，这里记录一下各个样式的修改，供大家参考

//焦点样式去除边框
  :deep(.el-tooltip__trigger:focus-visible) {
    outline: unset;
  }

//最外层边框样式
  :global(.el-popper.is-light){
    border: none;
  }

//箭头三角样式
  :global(.el-popper.is-light .el-popper__arrow::before) {
    background: #106197;
    border: none;
  }

//背景颜色
  :global(.dropDownStyle .el-dropdown-menu) {
    background: #106197;
  }

//字体颜色
  :global(.dropDownStyle .el-dropdown-menu__item) {
    color: #00d8ff;
  }

  //鼠标移入背景颜色
  :global(.dropDownStyle .el-dropdown-menu__item:hover) {
    background-color:rgba(12, 53, 95, 0.6) !important;
}

所有代码如下

<el-dropdown @command="handleCommand" popper-class="dropDownStyle">
          <div>
            <el-icon><Sunny /></el-icon><span>天气模拟</span>
          </div>
          <template #dropdown>
            <el-dropdown-menu>
              <el-dropdown-item command="晴天">默认</el-dropdown-item>
              <el-dropdown-item command="1">雨天</el-dropdown-item>
              <el-dropdown-item command="2">雪天</el-dropdown-item>
              <el-dropdown-item command="3">大雾</el-dropdown-item>
              <el-dropdown-item command="4">黑白</el-dropdown-item>
              <el-dropdown-item command="5">夜视</el-dropdown-item>
            </el-dropdown-menu>
          </template>
</el-dropdown>





<style lang-"less" scoped>
//焦点样式去除边框
  :deep(.el-tooltip__trigger:focus-visible) {
     outline: unset;
  }
 //最外层边框样式
  :global(.el-popper.is-light){
     border: none;
  }
//箭头三角样式
  :global(.el-popper.is-light .el-popper__arrow::before) {
    background: #106197;
    border: none;
  }
  //背景颜色
  :global(.dropDownStyle .el-dropdown-menu) {
     background: #106197;
  }
  //字体颜色
  :global(.dropDownStyle .el-dropdown-menu__item) {
    color: #00d8ff;
  }
  //鼠标移入背景颜色
  :global(.dropDownStyle .el-dropdown-menu__item:hover) {
     background-color:rgba(12, 53, 95, 0.6) !important;
}
</style>