diff --git a/README.md b/README.md
index 21a1d4a..da4a747 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,20 @@ Add below into your VSCode setting.
 
 ```json
     "markdown.marp.themes": [
-        "https://raw.githubusercontent.com/pn11/marp-A4-theme/main/themes/A4.css",
+        "https://raw.githubusercontent.com/honyaplan/marp-paper-size-theme/main/themes/A3_Landscape.css",
+        "https://raw.githubusercontent.com/honyaplan/marp-paper-size-theme/main/themes/A3_Portrait.css",
+        "https://raw.githubusercontent.com/honyaplan/marp-paper-size-theme/main/themes/A4_Landscape.css",
+        "https://raw.githubusercontent.com/honyaplan/marp-paper-size-theme/main/themes/A4_Portrait.css",
+        "https://raw.githubusercontent.com/honyaplan/marp-paper-size-theme/main/themes/A5_Landscape.css",
+        "https://raw.githubusercontent.com/honyaplan/marp-paper-size-theme/main/themes/A5_Portrait.css",
+        "https://raw.githubusercontent.com/honyaplan/marp-paper-size-theme/main/themes/A6_Landscape.css",
+        "https://raw.githubusercontent.com/honyaplan/marp-paper-size-theme/main/themes/A6_Portrait.css",
+        "https://raw.githubusercontent.com/honyaplan/marp-paper-size-theme/main/themes/B3_Landscape.css",
+        "https://raw.githubusercontent.com/honyaplan/marp-paper-size-theme/main/themes/B3_Portrait.css",
+        "https://raw.githubusercontent.com/honyaplan/marp-paper-size-theme/main/themes/B4_Landscape.css",
+        "https://raw.githubusercontent.com/honyaplan/marp-paper-size-theme/main/themes/B4_Portrait.css",
+        "https://raw.githubusercontent.com/honyaplan/marp-paper-size-theme/main/themes/B5_Landscape.css",
+        "https://raw.githubusercontent.com/honyaplan/marp-paper-size-theme/main/themes/B5_Portrait.css",
     ],
 ```
 
@@ -17,9 +30,25 @@ Specify the theme in your markdown header.
 ```markdown
 ---
 marp: true
-theme: A4
+theme: A4-Portrait
 ---
 
+A3_Landscape
+A3-Portrait
+A4_Landscape
+A4-Portrait
+A5_Landscape
+A5-Portrait
+A6_Landscape
+A6-Portrait
+B3_Landscape
+B3-Portrait
+B4_Landscape
+B4-Portrait
+B5_Landscape
+B5-Portrait
+
+
 # My slide
 
 This is slide.
diff --git a/themes/A3_Landscape.css b/themes/A3_Landscape.css
new file mode 100644
index 0000000..bf05669
--- /dev/null
+++ b/themes/A3_Landscape.css
@@ -0,0 +1,26 @@
+/* @theme A3-Landscape */
+
+@import 'default';
+
+section {
+  /* A3 document size */
+
+  width: 420mm;
+  height: 297mm;
+}
+
+h2 {
+  font-size: 30px;
+}
+
+h3 {
+  font-size: 25px;
+}
+
+p {
+  font-size: 20px;
+}
+
+li {
+  font-size: 20px;
+}
diff --git a/themes/A3_Portrait.css b/themes/A3_Portrait.css
new file mode 100644
index 0000000..c3162b8
--- /dev/null
+++ b/themes/A3_Portrait.css
@@ -0,0 +1,26 @@
+/* @theme A3-Portrait */
+
+@import 'default';
+
+section {
+  /* A3 document size */
+
+  width: 297mm;
+  height: 420mm;
+}
+
+h2 {
+  font-size: 30px;
+}
+
+h3 {
+  font-size: 25px;
+}
+
+p {
+  font-size: 20px;
+}
+
+li {
+  font-size: 20px;
+}
diff --git a/themes/A4_Landscape.css b/themes/A4_Landscape.css
new file mode 100644
index 0000000..54280df
--- /dev/null
+++ b/themes/A4_Landscape.css
@@ -0,0 +1,26 @@
+/* @theme A4-Landscape */
+
+@import 'default';
+
+section {
+  /* A4 document size */
+
+  width: 297mm;
+  height: 210mm;
+}
+
+h2 {
+  font-size: 30px;
+}
+
+h3 {
+  font-size: 25px;
+}
+
+p {
+  font-size: 20px;
+}
+
+li {
+  font-size: 20px;
+}
diff --git a/themes/A4.css b/themes/A4_Portrait.css
similarity index 88%
rename from themes/A4.css
rename to themes/A4_Portrait.css
index 92b775c..0c810d9 100644
--- a/themes/A4.css
+++ b/themes/A4_Portrait.css
@@ -1,9 +1,10 @@
-/* @theme A4 */
+/* @theme A4-Portrait */
 
 @import 'default';
 
 section {
   /* A4 document size */
+
   width: 210mm;
   height: 297mm;
 }
diff --git a/themes/A5_Landscape.css b/themes/A5_Landscape.css
new file mode 100644
index 0000000..8a48f08
--- /dev/null
+++ b/themes/A5_Landscape.css
@@ -0,0 +1,25 @@
+/* @theme A5-Landscape */
+
+@import 'default';
+
+section {
+  /* A5 document size */
+
+  width: 210mm;
+  height: 148mm;
+}
+h2 {
+  font-size: 30px;
+}
+
+h3 {
+  font-size: 25px;
+}
+
+p {
+  font-size: 20px;
+}
+
+li {
+  font-size: 20px;
+}
diff --git a/themes/A5_Portrait.css b/themes/A5_Portrait.css
new file mode 100644
index 0000000..e574d8e
--- /dev/null
+++ b/themes/A5_Portrait.css
@@ -0,0 +1,26 @@
+/* @theme A5-Portrait */
+
+@import 'default';
+
+section {
+  /* A5 document size */
+
+  width: 148mm;
+  height: 210mm;
+}
+
+h2 {
+  font-size: 30px;
+}
+
+h3 {
+  font-size: 25px;
+}
+
+p {
+  font-size: 20px;
+}
+
+li {
+  font-size: 20px;
+}
diff --git a/themes/A6_Landscape.css b/themes/A6_Landscape.css
new file mode 100644
index 0000000..fad970b
--- /dev/null
+++ b/themes/A6_Landscape.css
@@ -0,0 +1,26 @@
+/* @theme A6-Landscape */
+
+@import 'default';
+
+section {
+  /* A6 document size */
+
+  width: 148mm;
+  height: 105mm;
+}
+
+h2 {
+  font-size: 30px;
+}
+
+h3 {
+  font-size: 25px;
+}
+
+p {
+  font-size: 20px;
+}
+
+li {
+  font-size: 20px;
+}
diff --git a/themes/A6_Portrait.css b/themes/A6_Portrait.css
new file mode 100644
index 0000000..8cde3d3
--- /dev/null
+++ b/themes/A6_Portrait.css
@@ -0,0 +1,26 @@
+/* @theme A6-Portrait */
+
+@import 'default';
+
+section {
+  /* A6 document size */
+
+  width: 105mm;
+  height: 148mm;
+}
+
+h2 {
+  font-size: 30px;
+}
+
+h3 {
+  font-size: 25px;
+}
+
+p {
+  font-size: 20px;
+}
+
+li {
+  font-size: 20px;
+}
diff --git a/themes/B3_Landscape.css b/themes/B3_Landscape.css
new file mode 100644
index 0000000..8b53097
--- /dev/null
+++ b/themes/B3_Landscape.css
@@ -0,0 +1,26 @@
+/* @theme B3-Landscape */
+
+@import 'default';
+
+section {
+  /* B3 document size */
+
+  width: 500mm;
+  height: 353mm;
+}
+
+h2 {
+  font-size: 30px;
+}
+
+h3 {
+  font-size: 25px;
+}
+
+p {
+  font-size: 20px;
+}
+
+li {
+  font-size: 20px;
+}
diff --git a/themes/B3_Portrait.css b/themes/B3_Portrait.css
new file mode 100644
index 0000000..a5ff842
--- /dev/null
+++ b/themes/B3_Portrait.css
@@ -0,0 +1,26 @@
+/* @theme B3-Portrait */
+
+@import 'default';
+
+section {
+  /* B3 document size */
+
+  width: 353mm;
+  height: 500mm;
+}
+
+h2 {
+  font-size: 30px;
+}
+
+h3 {
+  font-size: 25px;
+}
+
+p {
+  font-size: 20px;
+}
+
+li {
+  font-size: 20px;
+}
diff --git a/themes/B4_Landscape.css b/themes/B4_Landscape.css
new file mode 100644
index 0000000..efaf130
--- /dev/null
+++ b/themes/B4_Landscape.css
@@ -0,0 +1,27 @@
+
+/* @theme B4-Landscape */
+
+@import 'default';
+
+section {
+  /* B4 document size */
+
+  width: 353mm;
+  height: 250mm;
+}
+
+h2 {
+  font-size: 30px;
+}
+
+h3 {
+  font-size: 25px;
+}
+
+p {
+  font-size: 20px;
+}
+
+li {
+  font-size: 20px;
+}
diff --git a/themes/B4_Portrait.css b/themes/B4_Portrait.css
new file mode 100644
index 0000000..a4e6bcf
--- /dev/null
+++ b/themes/B4_Portrait.css
@@ -0,0 +1,26 @@
+/* @theme B4-Portrait */
+
+@import 'default';
+
+section {
+  /* B4 document size */
+
+  width: 250mm;
+  height: 353mm;
+}
+
+h2 {
+  font-size: 30px;
+}
+
+h3 {
+  font-size: 25px;
+}
+
+p {
+  font-size: 20px;
+}
+
+li {
+  font-size: 20px;
+}
diff --git a/themes/B5_Landscape.css b/themes/B5_Landscape.css
new file mode 100644
index 0000000..7bbb5e1
--- /dev/null
+++ b/themes/B5_Landscape.css
@@ -0,0 +1,26 @@
+/* @theme B5-Portrait */
+
+@import 'default';
+
+section {
+  /* B5 document size */
+
+  width: 176mm;
+  height: 250mm;
+}
+
+h2 {
+  font-size: 30px;
+}
+
+h3 {
+  font-size: 25px;
+}
+
+p {
+  font-size: 20px;
+}
+
+li {
+  font-size: 20px;
+}
diff --git a/themes/B5_Portrait.css b/themes/B5_Portrait.css
new file mode 100644
index 0000000..7bbb5e1
--- /dev/null
+++ b/themes/B5_Portrait.css
@@ -0,0 +1,26 @@
+/* @theme B5-Portrait */
+
+@import 'default';
+
+section {
+  /* B5 document size */
+
+  width: 176mm;
+  height: 250mm;
+}
+
+h2 {
+  font-size: 30px;
+}
+
+h3 {
+  font-size: 25px;
+}
+
+p {
+  font-size: 20px;
+}
+
+li {
+  font-size: 20px;
+}