website: Improve the gem5art blog post's media

* Make the big picture more compact.
* Adjust the resolution ratio of the embedded Youtube video.

Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Change-Id: I567f019cdffc2eb0b946d51d73e5628d4f83aae4
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/35336
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: Jason Lowe-Power <power.jg@gmail.com>
diff --git a/_posts/2020-05-26-gem5art.md b/_posts/2020-05-26-gem5art.md
index 25a1a58..de2c4fd 100644
--- a/_posts/2020-05-26-gem5art.md
+++ b/_posts/2020-05-26-gem5art.md
@@ -5,7 +5,7 @@
 date:   2020-05-26
 ---
 
-![gem5art-logo](/assets/img/blog/gem5art.svg)
+<img src="/assets/img/blog/gem5art.svg" alt="gem5art-logo" width="100%" style="max-width:300px;"/>
 
 # gem5art: a gem5 Experiment Framework
 Hoa Nguyen, Ayaz Akram, Mahyar Samani, Krithiga Murugavel, Trivikram Reddy, Marjan Fariborz, Pouya Fotouhi, Jason Lowe-Power
@@ -94,4 +94,4 @@
 
 ## Workshop Presentation
 
-<iframe width="560" height="315" src="https://www.youtube.com/embed/x2GQa26xwzs" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
+<iframe width="1280" height="720" src="https://www.youtube.com/embed/x2GQa26xwzs" frameborder="0" allow="encrypted-media; picture-in-picture" allowfullscreen></iframe>