static/includes/_cells.scss

@@ -275,7 +275,6 @@ div.wcscurrentformscell ul {
 .gru-content div.link-list-cell.has-asset-picture,
 .gru-content div.wcsformsofcategorycell.has-asset-picture {
 	picture img {
-		max-width: 100%;
 		display: block;
 		padding: $cell-image-padding;
 	}

static/includes/_general.scss

@@ -35,3 +35,8 @@ a {
 a > img {
 	border: none;
 }
+
+img {
+	max-width: 100%;
+	height: auto;
+}

static/includes/_misc.scss

@@ -44,12 +44,6 @@ div.textcell {
 	}
 }
 
-@media screen and ($max-mobile-viewport) {
-	img {
-		max-width: 100%;
-	}
-}
-
 span#environment-label,
 div#footer div.cell.test-banner {
 	position: fixed;
@@ -599,7 +593,6 @@ div#user-files {
 		max-width: 100px;
 		img {
 			min-width: 60px;
-			max-width: 100%;
 		}
 	}
 

static/includes/wcs/_bulk.scss

@@ -653,6 +653,7 @@ div.file-upload-widget {
 			}
 			img {
 				max-height: 100%;
+				max-width: auto;
 				position: relative;
 				z-index: 10;
 			}