diff --git a/assets/scss/gametheory.scss b/assets/scss/gametheory.scss
new file mode 100644
index 0000000..b56662b
--- /dev/null
+++ b/assets/scss/gametheory.scss
@@ -0,0 +1,11 @@
+@import "variables.scss";
+@import "mixins.scss";
+
+.assumption-number {
+    font-weight: bold;
+}
+
+.assumption {
+    @include bordered-block;
+    padding: 0.8rem;
+}
diff --git a/layouts/shortcodes/gt_assumption.html b/layouts/shortcodes/gt_assumption.html
new file mode 100644
index 0000000..7ec776e
--- /dev/null
+++ b/layouts/shortcodes/gt_assumption.html
@@ -0,0 +1,9 @@
+{{ $n := .Page.Scratch.Get "gt-assumption-count" }}
+{{ $newN := add 1 (int $n) }}
+{{ .Page.Scratch.Set "gt-assumption-count" $newN }}
+{{ .Page.Scratch.SetInMap "gt-assumptions" (.Get 0) $newN }}
+<div class="assumption">
+    <span id="gt-assumption-{{ .Get 0 }}" class="assumption-number">
+        Assumption {{ $newN }} ({{ .Get 1 }}).
+    </span> {{ .Inner }}
+</div>
diff --git a/layouts/shortcodes/gt_css.html b/layouts/shortcodes/gt_css.html
new file mode 100644
index 0000000..c514249
--- /dev/null
+++ b/layouts/shortcodes/gt_css.html
@@ -0,0 +1,2 @@
+{{ $style := resources.Get "scss/gametheory.scss" | resources.ToCSS | resources.Minify }}
+<link rel="stylesheet" href="{{ $style.Permalink }}">
diff --git a/layouts/shortcodes/gt_link.html b/layouts/shortcodes/gt_link.html
new file mode 100644
index 0000000..bbcc32c
--- /dev/null
+++ b/layouts/shortcodes/gt_link.html
@@ -0,0 +1 @@
+<a href="#gt-assumption-{{ .Get 0 }}">assumption {{ index (.Page.Scratch.Get "gt-assumptions") (.Get 0) }}</a>