diff --git a/assets/style-course.css b/assets/style-course.css
index b988409..ff5703b 100644
--- a/assets/style-course.css
+++ b/assets/style-course.css
@@ -54,10 +54,20 @@
   align-items: start;
 }
 
+.question.layout-not-found {
+  background: #f88;
+}
+.question.layout-not-found .question-text {
+  margin-bottom: 1ex;
+}
+.question.layout-not-found .answers {
+  display: none;
+}
+
 .question.layout-2 .answers,
 .question.layout-6 .answers,
 .question.layout-8 .answers {
-  grid-template-columns: repeat(2, calc(50% - 1ex/2));
+  grid-template-columns: repeat(2, calc(50% - 1ex / 2));
 }
 
 .question .answers button {
@@ -82,10 +92,10 @@
   display: none;
 }
 .question .answers button.correct {
-  background: #3BB583;
+  background: #3bb583;
 }
 .question .answers button.wrong {
-  background: #FE756C;
+  background: #fe756c;
 }
 
 .question .answers button.correct .result,
@@ -130,34 +140,36 @@ figcaption {
   margin-left: calc(40px + 10%);
 }
 
-.qso_own:after{
-	content: ' ';
-	position: absolute;
-	width: 0;
-	height: 0;
+.qso_own:after {
+  content: " ";
+  position: absolute;
+  width: 0;
+  height: 0;
   left: -20px;
-	right: auto;
+  right: auto;
   top: 0px;
-	bottom: auto;
-	border: 22px solid;
-	border-color: #ddd transparent transparent transparent;
+  bottom: auto;
+  border: 22px solid;
+  border-color: #ddd transparent transparent transparent;
 }
 
-.qso_other:after{
-	content: ' ';
-	position: absolute;
-	width: 0;
-	height: 0;
+.qso_other:after {
+  content: " ";
+  position: absolute;
+  width: 0;
+  height: 0;
   left: auto;
-	right: -20px;
+  right: -20px;
   top: 0px;
-	bottom: auto;
-	border: 20px solid;
-	border-color: #ddd transparent transparent transparent;
+  bottom: auto;
+  border: 20px solid;
+  border-color: #ddd transparent transparent transparent;
 }
 
-
-p, li, tr, td {
+p,
+li,
+tr,
+td {
   hyphens: auto;
   -webkit-hyphens: auto;
   text-align: justify;
@@ -191,7 +203,6 @@ footer {
   clear: right;
 }
 
-
 span.morse {
   font-size: 33%;
   position: relative;
@@ -215,14 +226,14 @@ span.formula {
 .info_alpha {
   margin-bottom: 2ex;
   padding: 2ex;
-  background: #FF756D;
+  background: #ff756d;
   color: #fff;
 }
 
 .info_beta {
   margin-bottom: 2ex;
   padding: 2ex;
-  background: #B8EAFF;
+  background: #b8eaff;
 }
 
 .info_beta a {
@@ -235,7 +246,7 @@ span.formula {
   .course .table,
   .course ul.list,
   .course ol.list {
-      width: 59.3%;
+    width: 59.3%;
   }
 
   .course .margin {
@@ -250,11 +261,10 @@ span.formula {
     width: 100%;
   }
 
-
   .course .margin p,
   .course .margin ul.list,
   .course .margin ol.list {
-      width: auto;
+    width: auto;
   }
 
   .margin .photo,
@@ -271,17 +281,16 @@ span.formula {
 }
 
 @media (max-width: 800px) {
-
-    .course .margin {
-      margin-top: 4ex;
-      margin-bottom: 4ex;
-    }
+  .course .margin {
+    margin-top: 4ex;
+    margin-bottom: 4ex;
+  }
 }
 
 .course .margin em {
   font-style: normal;
   font-weight: 600;
-  color: #2AA6DA;
+  color: #2aa6da;
 }
 
 .course .tip p,
@@ -297,43 +306,42 @@ span.formula {
 .course .margin.indepth:before,
 .course .margin.attention:before,
 .course .margin.danger:before {
-    background-position: left bottom;
-    background-repeat: no-repeat;
-    background-size: contain;
-    display: block;
-    padding: 0.4ex 0 0.4ex 4ex;
-    line-height: 133%;
-    margin-bottom: 0.5ex;
+  background-position: left bottom;
+  background-repeat: no-repeat;
+  background-size: contain;
+  display: block;
+  padding: 0.4ex 0 0.4ex 4ex;
+  line-height: 133%;
+  margin-bottom: 0.5ex;
 }
 
-
 .course .margin.tip,
 .course .margin.unit,
 .course .margin.indepth,
 .course .margin.attention,
 .course .margin.danger {
-    border-left: 5px solid #bbb;
-    padding-left: 0.5em;
+  border-left: 5px solid #bbb;
+  padding-left: 0.5em;
 }
 
 .course .margin.tip {
-  border-left-color: #2AA6DA;
+  border-left-color: #2aa6da;
 }
 
 .course .margin.tip:before {
-content: "Tipp";
-background-color: #B8EAFF;
-background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" height="24" viewBox="0 -960 960 960" width="24"><path d="M440-280h80v-240h-80v240Zm40-320q17 0 28.5-11.5T520-640q0-17-11.5-28.5T480-680q-17 0-28.5 11.5T440-640q0 17 11.5 28.5T480-600Zm0 520q-83 0-156-31.5T197-197q-54-54-85.5-127T80-480q0-83 31.5-156T197-763q54-54 127-85.5T480-880q83 0 156 31.5T763-763q54 54 85.5 127T880-480q0 83-31.5 156T763-197q-54 54-127 85.5T480-80Zm0-80q134 0 227-93t93-227q0-134-93-227t-227-93q-134 0-227 93t-93 227q0 134 93 227t227 93Zm0-320Z"/></svg>');
+  content: "Tipp";
+  background-color: #b8eaff;
+  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" height="24" viewBox="0 -960 960 960" width="24"><path d="M440-280h80v-240h-80v240Zm40-320q17 0 28.5-11.5T520-640q0-17-11.5-28.5T480-680q-17 0-28.5 11.5T440-640q0 17 11.5 28.5T480-600Zm0 520q-83 0-156-31.5T197-197q-54-54-85.5-127T80-480q0-83 31.5-156T197-763q54-54 127-85.5T480-880q83 0 156 31.5T763-763q54 54 85.5 127T880-480q0 83-31.5 156T763-197q-54 54-127 85.5T480-80Zm0-80q134 0 227-93t93-227q0-134-93-227t-227-93q-134 0-227 93t-93 227q0 134 93 227t227 93Zm0-320Z"/></svg>');
 }
 
 .course .margin.unit {
-  border-left-color: #40C08C;
+  border-left-color: #40c08c;
 }
 
 .course .margin.unit:before {
-content: "Neue Einheit";
-background-color: #B5E8D3;
-background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" height="24" viewBox="0 -960 960 960" width="24"><path d="M208-120q-37 0-62.5-25.5T120-208v-548q0-29 27-40.5t47 8.5l90 90-54 54 28 28 54-54 104 104-54 54 28 28 54-54 104 104-54 54 28 28 54-54 104 104-54 54 28 28 54-54 80 80q20 20 8.5 47T756-120H208Zm32-120h332L240-572v332Z"/></svg>');
+  content: "Neue Einheit";
+  background-color: #b5e8d3;
+  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" height="24" viewBox="0 -960 960 960" width="24"><path d="M208-120q-37 0-62.5-25.5T120-208v-548q0-29 27-40.5t47 8.5l90 90-54 54 28 28 54-54 104 104-54 54 28 28 54-54 104 104-54 54 28 28 54-54 104 104-54 54 28 28 54-54 80 80q20 20 8.5 47T756-120H208Zm32-120h332L240-572v332Z"/></svg>');
 }
 
 .course .margin.indepth:before {
@@ -343,48 +351,48 @@ background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/200
 }
 
 .course .margin.attention {
-    border-left-color: #FFB300;
+  border-left-color: #ffb300;
 }
 
 .course .margin.attention:before {
-    content: "Achtung";
-    background-color: #FFE5A9;
-    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" height="24" viewBox="0 -960 960 960" width="24"><path d="M480-280q17 0 28.5-11.5T520-320q0-17-11.5-28.5T480-360q-17 0-28.5 11.5T440-320q0 17 11.5 28.5T480-280Zm-40-160h80v-240h-80v240Zm40 360q-83 0-156-31.5T197-197q-54-54-85.5-127T80-480q0-83 31.5-156T197-763q54-54 127-85.5T480-880q83 0 156 31.5T763-763q54 54 85.5 127T880-480q0 83-31.5 156T763-197q-54 54-127 85.5T480-80Zm0-80q134 0 227-93t93-227q0-134-93-227t-227-93q-134 0-227 93t-93 227q0 134 93 227t227 93Zm0-320Z"/></svg>');
+  content: "Achtung";
+  background-color: #ffe5a9;
+  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" height="24" viewBox="0 -960 960 960" width="24"><path d="M480-280q17 0 28.5-11.5T520-320q0-17-11.5-28.5T480-360q-17 0-28.5 11.5T440-320q0 17 11.5 28.5T480-280Zm-40-160h80v-240h-80v240Zm40 360q-83 0-156-31.5T197-197q-54-54-85.5-127T80-480q0-83 31.5-156T197-763q54-54 127-85.5T480-880q83 0 156 31.5T763-763q54 54 85.5 127T880-480q0 83-31.5 156T763-197q-54 54-127 85.5T480-80Zm0-80q134 0 227-93t93-227q0-134-93-227t-227-93q-134 0-227 93t-93 227q0 134 93 227t227 93Zm0-320Z"/></svg>');
 }
 
 .course .margin.danger {
-    border-left-color: #FF756D;
+  border-left-color: #ff756d;
 }
 
 .course .margin.danger:before {
-    content: "Gefahr";
-    background-color: #FFCFCC;
-    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" height="24" viewBox="0 -960 960 960" width="24"><path d="m40-120 440-760 440 760H40Zm138-80h604L480-720 178-200Zm302-40q17 0 28.5-11.5T520-280q0-17-11.5-28.5T480-320q-17 0-28.5 11.5T440-280q0 17 11.5 28.5T480-240Zm-40-120h80v-200h-80v200Zm40-100Z"/></svg>');
+  content: "Gefahr";
+  background-color: #ffcfcc;
+  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" height="24" viewBox="0 -960 960 960" width="24"><path d="m40-120 440-760 440 760H40Zm138-80h604L480-720 178-200Zm302-40q17 0 28.5-11.5T520-280q0-17-11.5-28.5T480-320q-17 0-28.5 11.5T440-280q0 17 11.5 28.5T480-240Zm-40-120h80v-200h-80v200Zm40-100Z"/></svg>');
 }
 
 .course-toc,
 .chapter-toc {
-    width: 600px;
-    max-width: calc(100vw - 20px);
+  width: 600px;
+  max-width: calc(100vw - 20px);
 }
 
 .course-toc .btn-label,
 .chapter-toc .btn-label {
   position: relative;
-	left: -12px;
+  left: -12px;
   width: 4em;
-	display: inline-block;
-	padding: 6px 12px;
-	background: #00ADEF;
+  display: inline-block;
+  padding: 6px 12px;
+  background: #00adef;
   color: #fff;
-	border-radius: 3px 0 0 3px;
+  border-radius: 3px 0 0 3px;
   text-align: right;
 }
 
 .course-toc .btn-labeled,
 .chapter-toc .btn-labeled {
-	padding-top: 0;
-	padding-bottom: 0;
+  padding-top: 0;
+  padding-bottom: 0;
   text-align: left;
 }
 
@@ -407,4 +415,3 @@ background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/200
 .answers button:nth-child(4):before {
   content: "D:";
 }
-
diff --git a/src/build.py b/src/build.py
index fa62b01..b81c66f 100644
--- a/src/build.py
+++ b/src/build.py
@@ -57,8 +57,15 @@ class Build:
             metadata = json.load(file)
             number = metadata[f"{input}"]["number"]  # Fragennummer z.B. AB123
 
-            question = self.questions[number]
-            metadata = metadata[f"{input}"]
+            if f"{input}" in metadata:
+                metadata = metadata[f"{input}"]
+                number = metadata["number"]  # Fragennummer z.B. AB123
+                question = self.questions[number]
+            else:
+                tqdm.write(f"\033[31mQuestion {input} is missing\033[0m")
+                metadata = {"layout": "not-found", "picture_a": ""}
+                number = 404
+                question = {"question": f"Frage {input} nicht gefunden"}
 
             if "answer_a" in question:
                 answers = [question["answer_a"], question["answer_b"], question["answer_c"], question["answer_d"]]