Make form columns and popover more responsive

assets/sass/_thumbnails.sass

@@ -0,0 +1,43 @@
+@import variables
+@import mixins
+
+.file-thumbnails
+  +display-flex
+  +flex-direction(row)
+  +flex-wrap
+  +justify-content(flex-start)
+
+.file-thumbnail
+  width: 250px
+  border: 1px solid #efefef
+  border-radius: 5px
+  margin-bottom: 20px
+  box-shadow: 4px 2px 10px -6px rgba(0, 0, 0, 0.55)
+  margin-right: 15px
+  img
+    border-top-left-radius: 5px
+    border-top-right-radius: 5px
+    &:hover
+      opacity: 0.5
+
+.file-thumbnail-content
+  padding-left: 8px
+  padding-right: 8px
+
+.file-thumbnail-title
+  font-weight: 700
+  font-size: size('compact')
+  color: color('medium')
+
+.file-thumbnail-description
+  font-size: size('small')
+  color: color('light')
+  margin-top: 8px
+  margin-bottom: 5px
+
+.file-viewer
+  position: relative
+  img
+    max-width: 95%
+    max-height: 85%
+    margin-top: 10px