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popper-class="test"
<el-tooltip content="Top center" placement="top-start" popper-class="atooltip">
<el-button>Dark</el-button>
</el-tooltip>
.atooltip.aui-tooltip__popper[x-placement^=top] .popper__arrow{
border-top-color: #e4f0f0 !important;
}
.atooltip.aui-tooltip__popper[x-placement^=top] .popper__arrow:after {
border-top-color: #e4f0f0 !important;
}
.atooltip.aui-tooltip__popper[x-placement^=bottom] .popper__arrow{
border-bottom-color: #e4f0f0 !important;
}
.atooltip.aui-tooltip__popper[x-placement^=bottom] .popper__arrow:after {
border-bottom-color: #e4f0f0 !important;
}
.atooltip{
background: #e4f0f0 !important;
border:1px solid #e4f0f0 !important;
}