Minor: covert OL to UL (#35378)

covert OL to UL

files/en-us/web/css/containing_block/index.md

@@ -34,11 +34,11 @@ The process for identifying the containing block depends entirely on the value o
 3. If the `position` property is **`fixed`**, the containing block is established by the {{glossary("viewport")}} (in the case of continuous media) or the page area (in the case of paged media).
 4. If the `position` property is **`absolute`** or **`fixed`**, the containing block may also be formed by the edge of the _padding box_ of the nearest ancestor element that has any of the following:
 
-   1. A {{cssxref("filter")}}, {{cssxref("backdrop-filter")}}, {{cssxref("transform")}}, or {{cssxref("perspective")}} value other than `none`.
-   2. A {{cssxref("contain")}} value of `layout`, `paint`, `strict` or `content` (e.g. `contain: paint;`).
-   3. A {{cssxref("container-type")}} value other than `normal`.
-   4. A {{cssxref("will-change")}} value containing a property for which a non-initial value would form a containing block (e.g. `filter` or `transform`).
-   5. A {{cssxref("content-visibility")}} value of `auto`.
+   - A {{cssxref("filter")}}, {{cssxref("backdrop-filter")}}, {{cssxref("transform")}}, or {{cssxref("perspective")}} value other than `none`.
+   - A {{cssxref("contain")}} value of `layout`, `paint`, `strict` or `content` (e.g. `contain: paint;`).
+   - A {{cssxref("container-type")}} value other than `normal`.
+   - A {{cssxref("will-change")}} value containing a property for which a non-initial value would form a containing block (e.g. `filter` or `transform`).
+   - A {{cssxref("content-visibility")}} value of `auto`.
 
 > [!NOTE]
 > The containing block in which the root element ({{HTMLElement("html")}}) resides is a rectangle called the **initial containing block**. It has the dimensions of the viewport (for continuous media) or the page area (for paged media).