Fix header .still-image on mobile

app/styles/components/account-header.scss

@@ -22,6 +22,7 @@
     background: var(--accent-color--med);
     @media screen and (max-width: 895px) {height: 225px;}
     &--none {height: 125px;}
+
     img {
       object-fit: cover;
       display: block;
@@ -30,6 +31,10 @@
       margin: 0;
     }
 
+    .still-image {
+      height: 100%;
+    }
+
     .still-image--play-on-hover::before {
       content: 'GIF';
       position: absolute;