diff --git a/.marp/theme.scss b/.marp/theme.scss
index 7975a87..4a97861 100644
--- a/.marp/theme.scss
+++ b/.marp/theme.scss
@@ -140,6 +140,23 @@ section > h6:first-child::before
 section:not(.chapter) > h2:first-child {
   font-size: 100%; }
 
+section.draft {
+    box-shadow: inset 20px 20px 0px red, inset -20px 20px 0px red, inset 20px -20px 0px red, inset -20px -20px 0px red;
+
+}
+
+section.draft::before {
+position: absolute;
+top: 50%;
+left: 50%;
+transform: translate(-50%, -50%) rotate(-30deg);
+font-size: 100px;
+display: block;
+content: "DRAFT";
+color: darkred;
+opacity: 0.25;
+}
+
 a {
   color: inherit;
   text-decoration: underline; }
@@ -168,10 +185,22 @@ bc-row > bc-column {
   flex: 1 1 0;
 }
 
+bc-row > bc-column[bc-margin-small] {
+  margin-left: 50px;
+}
+
+bc-row > bc-column[bc-margin-tiny] {
+  margin-left: 25px;
+}
+
 bc-row > bc-column[bc-text-small] {
   font-size: 90%;
 }
 
+bc-row > bc-column[bc-text-tiny] {
+  font-size: 80%;
+}
+
 bc-row > bc-column[bc-width-large] {
   flex: 2 1 0;
 }