去除el-tabs 下面的灰色横线，并修改每一项的左右间距，和字体颜色

HTML 

<el-tabs v-model="activeName" class="demo-tabs" @tab-click="handleClick"><el-tab-pane label="全部" :name="null"></el-tab-pane><el-tab-pane label="问答陪练" name="general-training"></el-tab-pane><el-tab-pane label="自由演练" name="free-training"></el-tab-pane>
</el-tabs>

CSS 

.demo-tabs {::v-deep {.el-tabs__nav-wrap::after {height: 0px;}.el-tabs__item {color: #767d8f;&.is-active{color: $--color-primary;font-weight: 600;}&:nth-child(2) {padding-right: 11px;}&:nth-child(3) {padding: 0 11px;}&:nth-child(4) {padding-left: 11px;}}}
}