Image upload widget

src/lib/components/BlockContainer.svelte

@@ -80,7 +80,7 @@
                     <div class="animation-wrapper"
                          class:hidden={hidden}
                          animate:flip={{duration:flipDurationMs}}
-                         style={item?.attrs?.flexGrow ? `flex-grow: ${item.attrs.flexGrow}` : ""}
+                         style={item?.attrs?.style || ""}
                     >
                         <WidgetContainer dragItem={item} zIndex={zIndex+1} {isMobile} />
                         {#if item[SHADOW_ITEM_MARKER_PROPERTY_NAME]}
@@ -238,6 +238,7 @@
  .animation-wrapper {
      position: relative;
      flex-grow: 100;
+     flex-basis: 0;
  }
 
  .handle-hidden {