diff --git a/www/conservancy/templates/supporter/banners.html b/www/conservancy/templates/supporter/banners.html
index 1941f94b..68de7de1 100644
--- a/www/conservancy/templates/supporter/banners.html
+++ b/www/conservancy/templates/supporter/banners.html
@@ -12,7 +12,8 @@
 
 <pre><code>  &lt;div style="margin: 0 auto; max-width: 1200px;"&gt;
     &lt;a href="https://sfconservancy.org/supporter"&gt;
-      &lt;img src="https://sfconservancy.org/img/banners/2018-individual.jpg"
+      &lt;img style="width: 100%;"
+           src="https://sfconservancy.org/img/banners/2018-individual.jpg"
            alt="Conservancy is a proponent for community driven free software projects.
                 Will you join me in supporting them? Donate today!"&gt;
     &lt;/a&gt;
@@ -21,7 +22,8 @@
 
 <div style="margin: 0 auto; max-width: 1200px;">
   <a href="https://sfconservancy.org/supporter">
-    <img src="/img/banners/2018-individual.jpg"
+    <img style="width: 100%;"
+         src="/img/banners/2018-individual.jpg"
          alt="Conservancy is a proponent for community driven free software projects.
               Will you join me in supporting them? Donate today!">
   </a>
@@ -31,7 +33,8 @@
 
 <pre><code>  &lt;div style="margin: 0 auto; max-width: 1200px;"&gt;
     &lt;a href="https://sfconservancy.org/supporter"&gt;
-      &lt;img src="https://sfconservancy.org/img/banners/2018-project.jpg"
+      &lt;img style="width: 100%;"
+           src="https://sfconservancy.org/img/banners/2018-project.jpg"
            alt="Conservancy helps make our work possible.
                 Please donate to them today to support community-driven free software projects!"
     &lt;/a&gt;
@@ -40,7 +43,8 @@
 
 <div style="margin: 0 auto; max-width: 1200px;">
   <a href="https://sfconservancy.org/supporter">
-    <img src="/img/banners/2018-project.jpg"
+    <img style="width: 100%;"
+         src="/img/banners/2018-project.jpg"
          alt="Conservancy helps make our work possible.
               Please donate to them today to support community-driven free software projects!"
   </a>