diff --git a/common/static/scss/_sidebar.scss b/common/static/scss/_sidebar.scss
index beb1cc05..06072aa6 100644
--- a/common/static/scss/_sidebar.scss
+++ b/common/static/scss/_sidebar.scss
@@ -47,8 +47,8 @@
     }
 
     .avatar {
-      height: calc(1rem * var(--pico-line-height) + var(--pico-nav-link-spacing-vertical) * 4);
-      width: calc(1rem * var(--pico-line-height) + var(--pico-nav-link-spacing-vertical) * 4);
+      max-height: calc(1rem * var(--pico-line-height) + var(--pico-nav-link-spacing-vertical) * 4);
+      max-width: calc(1rem * var(--pico-line-height) + var(--pico-nav-link-spacing-vertical) * 4);
 
       img {
         height: 100%;