should be of this component: the active selector sets the outline property, and then write another to overwrite this,: active {outline:none}

overwrite the following style.
.el-tabs__item:focus.is-active.is-focus:not (: active) {

-webkit-box-shadow: none;
box-shadow: none;

}

give tabs a custom style
.my _ tabs {
.el-tabs__header {

.el-tabs__nav-wrap{
  .el-tabs__nav-scroll{
    .el-tabs__item{
      box-shadow: none !important;
    }
  } 
}  

}
}

*:focus {
    outline: none
}