diff --git a/app/assets/stylesheets/common/base/lightbox.scss b/app/assets/stylesheets/common/base/lightbox.scss
index bc089ac1011..20ed8ebea62 100644
--- a/app/assets/stylesheets/common/base/lightbox.scss
+++ b/app/assets/stylesheets/common/base/lightbox.scss
@@ -50,17 +50,6 @@ $meta-element-margin: 6px;
     overflow: hidden;
     white-space: nowrap;
     text-overflow: ellipsis;
-    // TODO: delete this by May 2019
-    &:before {
-      // ideally, the SVG used here should be in HTML and reference the SVG sprite
-      content: svg-uri(
-        '<svg xmlns="http://www.w3.org/2000/svg" width="14px" height="16px" viewBox="0 0 512 512" fill="#{$secondary}"><path d="M464 64H48C21.49 64 0 85.49 0 112v288c0 26.51 21.49 48 48 48h416c26.51 0 48-21.49 48-48V112c0-26.51-21.49-48-48-48zm-6 336H54a6 6 0 0 1-6-6V118a6 6 0 0 1 6-6h404a6 6 0 0 1 6 6v276a6 6 0 0 1-6 6zM128 152c-22.091 0-40 17.909-40 40s17.909 40 40 40 40-17.909 40-40-17.909-40-40-40zM96 352h320v-80l-87.515-87.515c-4.686-4.686-12.284-4.686-16.971 0L192 304l-39.515-39.515c-4.686-4.686-12.284-4.686-16.971 0L96 304v48z"/></svg>'
-      );
-      margin-right: $meta-element-margin;
-      display: inline-block;
-      vertical-align: middle;
-      opacity: 0.8;
-    }
   }
 
   .d-icon {
@@ -70,10 +59,6 @@ $meta-element-margin: 6px;
     + .filename {
       margin-left: 0px;
     }
-    // TODO: delete this by May 2019
-    + .filename:before {
-      display: none;
-    }
   }
 
   .informations {
@@ -84,21 +69,6 @@ $meta-element-margin: 6px;
     flex-shrink: 0;
     flex-grow: 3;
   }
-
-  // TODO: delete this by May 2019
-  .expand {
-    position: absolute;
-    bottom: 2px;
-    right: 7px;
-    &:before {
-      // ideally, the SVG used here should be in HTML and reference the SVG sprite
-      // the SVG used here is the "expand" icon from FontAwesome 4.7.0
-      content: svg-uri(
-        '<svg xmlns="http://www.w3.org/2000/svg" width="14px" height="16px" viewBox="0 0 1792 1792" fill="#{$secondary}"><path d="M883 1056q0 13-10 23l-332 332 144 144q19 19 19 45t-19 45-45 19h-448q-26 0-45-19t-19-45v-448q0-26 19-45t45-19 45 19l144 144 332-332q10-10 23-10t23 10l114 114q10 10 10 23zm781-864v448q0 26-19 45t-45 19-45-19l-144-144-332 332q-10 10-23 10t-23-10l-114-114q-10-10-10-23t10-23l332-332-144-144q-19-19-19-45t19-45 45-19h448q26 0 45 19t19 45z"/></svg>'
-      );
-      opacity: 0.8;
-    }
-  }
 }
 
 .mfp-preloader .spinner {
diff --git a/app/assets/stylesheets/mobile/lightbox.scss b/app/assets/stylesheets/mobile/lightbox.scss
index 46a63a9a3a3..8c864502ba5 100644
--- a/app/assets/stylesheets/mobile/lightbox.scss
+++ b/app/assets/stylesheets/mobile/lightbox.scss
@@ -22,19 +22,4 @@
   .d-icon-discourse-expand {
     color: $primary-high;
   }
-
-  // TODO: Delete by May 2019
-  .expand {
-    position: initial;
-    float: none;
-    height: 16px;
-    &:before {
-      // ideally, the SVG used here should be in HTML and reference the SVG sprite
-      // the SVG used here is the "expand" icon from FontAwesome 4.7.0
-      content: svg-uri(
-        '<svg xmlns="http://www.w3.org/2000/svg" width="14px" height="16px" viewBox="0 0 1792 1792" fill="#{$primary-high}"><path d="M883 1056q0 13-10 23l-332 332 144 144q19 19 19 45t-19 45-45 19h-448q-26 0-45-19t-19-45v-448q0-26 19-45t45-19 45 19l144 144 332-332q10-10 23-10t23 10l114 114q10 10 10 23zm781-864v448q0 26-19 45t-45 19-45-19l-144-144-332 332q-10 10-23 10t-23-10l-114-114q-10-10-10-23t10-23l332-332-144-144q-19-19-19-45t19-45 45-19h448q26 0 45 19t19 45z"/></svg>'
-      );
-      opacity: inherit;
-    }
-  }
 }