Update README.md

docs/uniCloud/README.md

@@ -4,8 +4,9 @@
 
 从[HBuilderX 2.5.8](https://www.dcloud.io/hbuilderx.html)起支持。阿里云、腾讯云均已开放注册使用。
 
-<video width="100%" id="video" preload="none" controls="controls"
+<video style="width:50vw;height:37.5vw;" id="video" preload="none" controls="controls"
 	poster="https://vkceyugu.cdn.bspapp.com/VKCEYUGU-a90b5f95-90ba-4d30-a6a7-cd4d057327db/eb25cdcb-25c2-4f4f-b8c2-3797a12c6fe2.mp4?x-oss-process=video/snapshot,t_1000,f_jpg" src="https://vkceyugu.cdn.bspapp.com/VKCEYUGU-a90b5f95-90ba-4d30-a6a7-cd4d057327db/eb25cdcb-25c2-4f4f-b8c2-3797a12c6fe2.mp4"></video>
+</br>
 [更多视频教程](https://study.163.com/course/courseLearn.htm?courseId=1209978085#/learn/video?lessonId=1280845026&courseId=1209978085)