update: 更新

src/styles/element/index.scss

@@ -8,3 +8,4 @@
 @import './table.scss';
 @import './upload.scss';
 @import './tooltip.scss';
+@import './popover.scss';
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src/styles/element/popover.scss

+.el-popover {
+    padding: 5px 8px;
+    border-radius: 2px;
+    box-shadow: 0px 9px 28px 0px rgba(0, 0, 0, 0.05), 0px 6px 16px 0px rgba(0, 0, 0, 0.08),
+      0px 3px 6px 0px rgba(0, 0, 0, 0.12);
+}
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