diff --git a/src/003-assets/CSS/arcologyBuilding.css b/src/003-assets/CSS/arcologyBuilding.css
index a858bf26bb9305b39893a9e57cc1f6fc0e22a016..750410612e3a6aae3d0cbf28fe5093e6cfabc1a8 100644
--- a/src/003-assets/CSS/arcologyBuilding.css
+++ b/src/003-assets/CSS/arcologyBuilding.css
@@ -6,7 +6,7 @@ div.building {
 
 div.building.basement {
     box-shadow: 0 -1px 0 #333333;
-    background-image: repeating-linear-gradient(-45deg, transparent, transparent 20px, #333333 20px, #333333 30px);
+    background-image: repeating-linear-gradient(135deg, transparent, transparent 20px, #333333 20px, #333333 30px);
 }
 
 div.building div.row {
@@ -18,13 +18,18 @@ div.building div.row {
 }
 
 div.building div.outerCell {
-    text-align: center;
+    /* fill cell fully, part 1: trick to fill the full height even if content is smaller */
+    display: flex;
+    flex-direction: row;
 }
 
 div.building div.innerCell {
     margin: 3px;
     border: 5px solid;
     padding: 2px;
+    text-align: center;
+    /* fill cell fully, part 2: full width */
+    width: 100%;
     /* overwriting with the default background color to hide the basement indicator */
     background-color: #111;
 }