diff --git a/apps/course/templates/course/_items.html b/apps/course/templates/course/_items.html
index ac011437..1aceba54 100644
--- a/apps/course/templates/course/_items.html
+++ b/apps/course/templates/course/_items.html
@@ -9,7 +9,7 @@
 >
 <a class="courses__preview" href="{% if course.status <= 1 %}{% url 'course_edit' course.id %}{% else %}{{ course.url }}{% endif %}">
   {% if course.cover and course.cover.image_thumbnail %}
-  <img class="courses__pic" src="{{ course.cover.image_thumbnail.url }}" width="{{ course.cover.image_thumbnail.width }}" />
+  <img class="courses__pic" src="{{ course.cover.image_thumbnail.url }}" width="300px" />
   {% else %}
   <img class="courses__pic" src="{% static 'img/no_cover.png' %}" width="300px" />
   {% endif %}
diff --git a/project/settings.py b/project/settings.py
index 17b0d706..211a732b 100644
--- a/project/settings.py
+++ b/project/settings.py
@@ -253,6 +253,8 @@ MEDIA_ROOT = os.path.join(BASE_DIR, 'media')
 
 RESOURCES_ROOT = os.path.join(BASE_DIR, 'resources')
 
+IMAGEKIT_DEFAULT_CACHEFILE_STRATEGY = 'imagekit.cachefiles.strategies.Optimistic'
+
 LOGIN_URL = '/'
 # Email
 # https://github.com/anymail/django-anymail