diff --git a/src/css/custom.scss b/src/css/custom.scss
index 87ce93bec3..869a7a8ee5 100644
--- a/src/css/custom.scss
+++ b/src/css/custom.scss
@@ -241,3 +241,19 @@ select[data-testid="example-pairing-select"] {
   line-height: 1;
   display: inline-block;
 }
+
+/* Image Corner Rounding */
+
+.markdown img {
+  border-radius: 12px;
+}
+
+.markdown img[src$=".gif" i],
+.markdown img[src*=".gif?" i] {
+  border-radius: 21px;
+}
+
+/* opt out with `class="no-rounding"` */
+.markdown img.no-rounding {
+  border-radius: 0;
+}
diff --git a/static/assets/channel-accounts/congesting.png b/static/assets/channel-accounts/congesting.png
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diff --git a/static/assets/channel-accounts/custody.png b/static/assets/channel-accounts/custody.png
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diff --git a/static/assets/channel-accounts/layering.png b/static/assets/channel-accounts/layering.png
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diff --git a/static/assets/channel-accounts/maximization.png b/static/assets/channel-accounts/maximization.png
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diff --git a/static/assets/channel-accounts/segregation.png b/static/assets/channel-accounts/segregation.png
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diff --git a/static/assets/channel-accounts/signers.png b/static/assets/channel-accounts/signers.png
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diff --git a/static/assets/sdex/orderbook.png b/static/assets/sdex/orderbook.png
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