diff --git a/themes/academic.css b/themes/academic.css
index 2d863d0..41fc320 100644
--- a/themes/academic.css
+++ b/themes/academic.css
@@ -5,94 +5,95 @@
 @import url('https://fonts.googleapis.com/css2?family=Source+Code+Pro&display=swap');
 
 :root {
-  --color-background: #fff;
-  --color-foreground: #333;
-  --color-highlight: #800000;
+--color-background: #fff;
+--color-foreground: #333;
+--color-highlight: #003772;
 }
 
 section {
-  background-image: none;
-  font-family: 'Noto Sans JP', sans-serif;
-  padding-top: 90px;
-  padding-left: 40px;
-  padding-right: 40px;
+background-image: none;
+font-family: 'Noto Sans JP', sans-serif;
+padding-top: 90px;
+padding-left: 40px;
+padding-right: 40px;
 }
 
 /* https://github.com/marp-team/marpit/issues/271 */
 section::after {
-  font-weight: 700;
-  content: attr(data-marpit-pagination) '/' attr(data-marpit-pagination-total);
+font-weight: 700;
+content: attr(data-marpit-pagination) '/' attr(data-marpit-pagination-total);
 }
 
 ul ul {
-  font-size: 0.9em;
+font-size: 0.9em;
 }
 
 section.lead h1 {
-  color: #800000;
-  text-align: left;
+color: #003772;
+text-align: left;
 }
 section.lead h1 strong {
-  -webkit-text-stroke: 1px #800000;
+-webkit-text-stroke: 1px #003772;
 }
 section.lead h2 {
-  color: #800000;
-  text-align: left;
+color: #003772;
+text-align: left;
 }
 section.lead h2 strong {
-  -webkit-text-stroke: 1px #800000;
+-webkit-text-stroke: 1px #003772;
 }
 section.lead h3 {
-  color: #800000;
-  text-align: left;
+color: #003772;
+text-align: left;
 }
 section.lead h3 strong {
-  -webkit-text-stroke: 1px #800000;
+-webkit-text-stroke: 1px #003772;
 }
 section.lead h4 {
-  color: #800000;
-  text-align: left;
+color: #003772;
+text-align: left;
 }
 section.lead h4 strong {
-  -webkit-text-stroke: 1px #800000;
+-webkit-text-stroke: 1px #003772;
 }
 section.lead h5 {
-  color: #800000;
-  text-align: left;
+color: #003772;
+text-align: left;
 }
 section.lead h5 strong {
-  -webkit-text-stroke: 1px #800000;
+-webkit-text-stroke: 1px #003772;
 }
 section.lead p {
-  text-align: right;
+text-align: right;
 }
 
 header {
-  background-color: #800000;
-  color: #fff;
-  font-size: 1em;
-  font-weight: 700;
+background-color: #003772;
+color: #fff;
+font-size: 1em;
+font-weight: 700;
+z-index: 999;
 }
 
 blockquote {
-  max-width: 90%;
-  border-top: 0.1em dashed #555;
-  font-size: 60%;
-  position: absolute;
-  bottom: 20px;
+max-width: 90%;
+border-top: 0.1em dashed #555;
+font-size: 60%;
+position: absolute;
+bottom: 20px;
 }
 blockquote::before {
-  content: "";
+content: "";
 }
 blockquote::after {
-  content: "";
+content: "";
 }
 
 img[alt~="center"] {
-  display: block;
-  margin: 0 auto;
+display: block;
+margin: 0 auto;
 }
 
 code {
-  font-family: 'Source Code Pro', monospace;
+font-family: 'Source Code Pro', monospace;
 }
diff --git a/themes/beamer.css b/themes/beamer.css
new file mode 100644
index 0000000..76d886b
--- /dev/null
+++ b/themes/beamer.css
@@ -0,0 +1,126 @@
+/* @theme beamer */
+
+@import "default";
+
+:root {
+  font-family: "CMU Sans Serif", "Segoe UI", Helvetica, sans-serif;
+  --beamer-main: #1f38c5;
+  --beamer-secondary: #141414;
+}
+
+section {
+  background-color: #ffffff;
+  /* bottom two-coloured bar in base64 svg */
+  background-image:
+    url(data:image/svg+xml;base64,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);
+  background-repeat: no-repeat;
+  background-position: center bottom;
+  background-size: 150% 1em;
+  padding: 2em;
+}
+
+header {
+  font-size: 0.6em;
+  /* this text-align is important */
+  text-align: right;
+  /* I don't like this absolute positioning, but it works */
+  position: absolute;
+  top: 96.2%;
+  width: 100%;
+  right: 0;
+  left: -51%;
+  color: white;
+}
+
+footer {
+  font-size: 0.6em;
+  position: absolute;
+  /* this text-align is important */
+  text-align: left;
+  top: 96.2%;
+  width: 100%;
+  right: 0;
+  left: 50.8%;
+  color: white;
+}
+
+h1, h2, h3, h4, h5, h6 {
+  color: #141414;
+}
+
+/* only apply to the first occurrence of h1 */
+h1:nth-of-type(1) {
+  font-family: "CMU Bright", "Segoe UI Semibold";
+  color: #ffffff;
+  background-color: var(--beamer-main);
+  border-top: 0.3em solid var(--beamer-main);
+  padding: 0;
+  position: absolute;
+  top: 0;
+  right: 0;
+  width: 100%;
+  height: 1.5em;
+  text-indent: 0.5em;
+}
+
+code {
+  background-color: rgba(100, 100, 100, 0.2);
+}
+
+/* formatting page numbers  */
+section::after {
+  font-size: 0.6em;
+  /* https://github.com/yhatt/marp/issues/263 */
+  content: attr(data-marpit-pagination) ' / ' attr(data-marpit-pagination-total);
+  position: absolute;
+  text-align: right;
+  top: 96.2%;
+  width: 100%;
+  right: 0;
+  left: -0.5em;
+  color: white;
+}
+
+/* inline math was too large wrt text */
+.katex {
+  font: normal 1.05em KaTeX_Main, 'Times New Roman', serif
+}
+
+/* the "center" keyword centers the image - may break, careful */
+img[alt~="center"] {
+  display: block;
+  margin: 0 auto;
+}
+
+/* || SECTION CLASS: title */
+/* title page - only to be used as for a single slide */
+/* <!-- _class: title --> */
+section.title>h1 {
+  font-family: "CMU Bright", "Segoe UI Semibold";
+  color: #ffffff;
+  background-color: var(--beamer-main);
+  border-radius: 25px;
+  text-align: center;
+  top: 25%;
+  left: 0;
+  right: 0;
+  margin-left: auto;
+  margin-right: auto;
+  width: 80%;
+  padding-bottom: 0.2em;
+  height: auto;
+}
+
+/* remake this to be positioned with respect to h1 */
+section.title>p {
+  position: relative;
+  text-align: center;
+  top: 35px;
+}
+
+/* || SECTION CLASS: tinytext */
+/* new class that makes p, ul, and blockquote text smaller */
+/* might be useful for the References slide, use <!-- _class: tinytext --> */
+section.tinytext>p, section.tinytext>ul, section.tinytext>blockquote {
+  font-size: 0.65em;
+}