update:更新

src/components/app-stepper/app-stepper.scss

+.app-stepper{
+    .el-input-number__decrease,.el-input-number__increase{
+        width: 34px;
+        height: calc( 100% - 4px);
+        margin-top: 1px;
+    }
+    .el-input-number__increase{
+        border-left: 1px solid #dcdfe6!important ;
+    }
+}
 

src/styles/element/index.scss

 @import './radio-group.scss';
 @import './menu.scss';
 @import './autocomplete.scss';
-@import './input.scss';
+@import './input.scss';
\ No newline at end of file
+@import './stepper.scss';
\ No newline at end of file

src/styles/element/stepper.scss

+.el-input-number {
+    .el-input__inner:hover {
+        border-color: var(--app-color-blue);
+    }
+    &:hover{
+        border-color: var(--app-color-blue);
+    }
+}
+