fix #4355

Closes #4355

Merge request studip/studip!3170

resources/assets/stylesheets/scss/courseware/blockadder.scss

@@ -9,6 +9,7 @@
         display: flex;
         position: relative;
         border: solid thin var(--content-color-40);
+        background-color: var(--white);
         max-width: 268px;
 
         .cw-sortable-handle {
@@ -23,6 +24,13 @@
             }
         }
         .cw-blockadder-item {
+            display: inline-flex;
+            align-items: flex-start;
+            flex-direction: column;
+            text-align: left;
+            color: var(--base-color);
+            border: none;
+            background-color: var(--white);
             padding: 64px 10px 4px 10px;
             @include background-icon(unit-test, clickable, 48);
             background-position: 16px 10px;
@@ -43,6 +51,10 @@
                 display: inline-block;
                 margin: 0 0 4px;   
             }
+
+            &:hover {
+                color: var(--active-color);
+            }
         }
         .cw-blockadder-item-fav {
             height: 32px;
@@ -71,11 +83,15 @@
     }
 
     .cw-containeradder-item {
+        border: none;
+        background-color: var(--white);
         min-height: 5em;
         padding: 1em 1em 1em 6em;
         @include background-icon(unit-test, clickable, 48);
         background-position: 16px center;
         background-repeat: no-repeat;
+        text-align: left;
+        color: var(--base-color);
         cursor: pointer;
 
         @each $item, $icon in $containeradder-items {
@@ -87,6 +103,10 @@
         .cw-containeradder-item-title {
             font-weight: 600;
         }
+
+        &:hover {
+            color: var(--active-color);
+        }
     }
 }
 
@@ -135,6 +155,10 @@
             outline-width: 1px;
         }
     }
+
+    &.sortable-ghost {
+        background-color: var(--active-color);
+    }
 }
 .cw-element-inserter-wrapper {
     display: grid;
@@ -144,6 +168,7 @@
     margin-bottom: 8px;
 
     .cw-clipboard-item-wrapper {
+        background-color: var(--white);
         display: flex;
         border: solid thin var(--content-color-40);
         max-width: 248px;

resources/vue/components/courseware/toolbar/CoursewareBlockadderItem.vue

 <template>
     <div class="cw-blockadder-item-wrapper">
         <span class="cw-sortable-handle cw-sortable-handle-blockadder"></span>
-        <a href="#" class="cw-blockadder-item" :class="['cw-blockadder-item-' + type]" @click.prevent="addBlock">
+        <button class="cw-blockadder-item" :class="['cw-blockadder-item-' + type]" @click.prevent="addBlock">
             <header class="cw-blockadder-item-title">
                 {{ title }}
             </header>
             <p class="cw-blockadder-item-description">
                 {{ description }}
             </p>
-        </a>
+        </button>
         <button
             class="cw-blockadder-item-fav"
             :title="favButtonTitle"
@@ -17,7 +17,6 @@
             <studip-icon :shape="blockTypeIsFav ? 'star' : 'star-empty'" :size="20" />
         </button>
     </div>
-    
 </template>
 
 <script>

resources/vue/components/courseware/toolbar/CoursewareContainerAdderItem.vue

 <template>
     <div class="cw-containeradder-item-wrapper">
         <span class="cw-sortable-handle cw-sortable-handle-containeradder"></span>
-        <a href="#" @click.prevent="addNewContainer">
-            <div class="cw-containeradder-item" :class="['cw-containeradder-item-' + type]">
-                <header class="cw-containeradder-item-title">
-                    {{ title }}
-                </header>
-                <p class="cw-containeradder-item-description">
-                    {{ description }}
-                </p>
-            </div>
-        </a>
-        <li class="cw-container-dragitem cw-container-item-sortable" ref="container-drag-item">
-            <div class="cw-container cw-container-list cw-container-item" :class="['cw-container-colspan-' + colspan]">
-                <div class="cw-container-content">
-                    <header class="cw-container-header">{{ title }}</header>
-                    <div class="cw-block-wrapper">{{ description }}</div>
-                </div>
-            </div>
-        </li>
+        <button class="cw-containeradder-item" :class="['cw-containeradder-item-' + type]" @click.prevent="addNewContainer">
+            <header class="cw-containeradder-item-title">
+                {{ title }}
+            </header>
+            <p class="cw-containeradder-item-description">
+                {{ description }}
+            </p>
+        </button>
     </div>
 </template>
 <script>