Modify the floating and clicking styles of el-submenu__title and el-menu-item

    /deep/ .el-submenu__title:focus {
    
    
      color: @font-color;
      background: none;
    }
    /deep/ .el-submenu__title:hover {
    
    
      color: @font-color;
      background: none;
    }
    .el-menu-item:focus, .el-menu-item:hover {
    
    
      color: @font-color;
      background-color: @font-bg-color;
    }

After finding that the icon style has not changed, add the icon color change

    /deep/ .el-submenu__title:focus i {
    
    
      color: @font-color;
    }
    /deep/ .el-submenu__title:hover i {
    
    
      color: @font-color;
    }