diff --git a/README.md b/README.md
index 64da20f..55f17c0 100644
--- a/README.md
+++ b/README.md
@@ -27,15 +27,15 @@ Note that if you need to change the path at which the `fediverse-share-button` f
 ```html
 <form class="fsb-prompt">
   <label>Share with the fediverse</label>
-  <div class="input-group mb-3">
-    <span class="input-group-text">https://</span>
+  <div class="fsb-input-group mb-3">
+    <span class="fsb-input-group-text">https://</span>
     <input required
       type="text"
       name="fediverse-domain"
       placeholder="mastodon.social"
-      class="fsb-domain form-control"
+      class="fsb-input fsb-domain form-control"
       aria-label="Amount (to the nearest dollar)">
-    <button class="fsb-btn btn btn-outline-secondary"
+    <button class="fsb-button"
       type="submit"
       id="button-addon2"><img src="./fediverse-share-button/icons/mastodon.svg"
         class="fsb-icon"></span>Share</button>
diff --git a/fediverse-share-button/styles.css b/fediverse-share-button/styles.css
index 0e4885c..bb83e78 100644
--- a/fediverse-share-button/styles.css
+++ b/fediverse-share-button/styles.css
@@ -51,7 +51,7 @@
   border-bottom-right-radius: 0;
 }
 
-input {
+.fsb-input {
   box-sizing: border-box;
   margin: 0;
   font-family: inherit;
@@ -77,7 +77,7 @@ input {
   border-bottom-left-radius: 0;
 }
 
-button {
+.fsb-button {
   box-sizing: border-box;
   margin: 0;
   display: inline-block;
diff --git a/fediverse-share-button/styles.min.css b/fediverse-share-button/styles.min.css
index c71b140..68692c9 100644
--- a/fediverse-share-button/styles.min.css
+++ b/fediverse-share-button/styles.min.css
@@ -1 +1 @@
-.fsb-prompt{max-width:500px;margin-top:52px}.fsb-prompt label{display:block;margin-bottom:12px}.fsb-icon{max-width:14px;margin-right:10px;vertical-align:text-top}.fsb-support-note{font-size:small}.fsb-d-none{display:none!important}.fsb-input-group{box-sizing:border-box;position:relative;display:flex;flex-wrap:wrap;align-items:stretch;width:100%;margin-bottom:1rem!important}.fsb-input-group-text{box-sizing:border-box;display:flex;align-items:center;padding:.375rem .75rem;font-size:1rem;font-weight:400;line-height:1.5;text-align:center;white-space:nowrap;background-color:var(--bs-tertiary-bg);border:1px solid silver;border-radius:8px;border-top-right-radius:0;border-bottom-right-radius:0}input{box-sizing:border-box;margin:0;font-family:inherit;scroll-margin-top:80px;scroll-margin-bottom:100px;display:block;padding:.375rem .75rem;font-size:1rem;font-weight:400;line-height:1.5;appearance:none;background-clip:padding-box;border:1px solid silver;border-left:none;position:relative;flex:1 1 auto;width:1%;min-width:0;border-top-right-radius:0;border-bottom-right-radius:0;margin-left:calc(var(--bs-border-width) * -1);border-top-left-radius:0;border-bottom-left-radius:0}button{box-sizing:border-box;margin:0;display:inline-block;padding:6px 12px;text-align:center;text-decoration:none;vertical-align:middle;border:1px solid silver;border-radius:8px;background-color:var(--bs-btn-bg);cursor:pointer;position:relative;z-index:2;margin-left:-1;border-top-left-radius:0;border-bottom-left-radius:0}
+.fsb-prompt{max-width:500px;margin-top:52px}.fsb-prompt label{display:block;margin-bottom:12px}.fsb-icon{max-width:14px;margin-right:10px;vertical-align:text-top}.fsb-support-note{font-size:small}.fsb-d-none{display:none!important}.fsb-input-group{box-sizing:border-box;position:relative;display:flex;flex-wrap:wrap;align-items:stretch;width:100%;margin-bottom:1rem!important}.fsb-input-group-text{box-sizing:border-box;display:flex;align-items:center;padding:.375rem .75rem;font-size:1rem;font-weight:400;line-height:1.5;text-align:center;white-space:nowrap;background-color:var(--bs-tertiary-bg);border:1px solid silver;border-radius:8px;border-top-right-radius:0;border-bottom-right-radius:0}.fsb-input{box-sizing:border-box;margin:0;font-family:inherit;scroll-margin-top:80px;scroll-margin-bottom:100px;display:block;padding:.375rem .75rem;font-size:1rem;font-weight:400;line-height:1.5;appearance:none;background-clip:padding-box;border:1px solid silver;border-left:none;position:relative;flex:1 1 auto;width:1%;min-width:0;border-top-right-radius:0;border-bottom-right-radius:0;margin-left:calc(var(--bs-border-width) * -1);border-top-left-radius:0;border-bottom-left-radius:0}.fsb-button{box-sizing:border-box;margin:0;display:inline-block;padding:6px 12px;text-align:center;text-decoration:none;vertical-align:middle;border:1px solid silver;border-radius:8px;background-color:var(--bs-btn-bg);cursor:pointer;position:relative;z-index:2;margin-left:-1;border-top-left-radius:0;border-bottom-left-radius:0}
diff --git a/index.html b/index.html
index eb845cb..7e67c2a 100644
--- a/index.html
+++ b/index.html
@@ -78,9 +78,9 @@
         type="text"
         name="fediverse-domain"
         placeholder="mastodon.social"
-        class="fsb-domain form-control"
+        class="fsb-input fsb-domain form-control"
         aria-label="Amount (to the nearest dollar)">
-      <button class="fsb-btn btn btn-outline-secondary"
+      <button class="fsb-button"
         type="submit"
         id="button-addon2"><img src="./fediverse-share-button/icons/mastodon.svg"
           class="fsb-icon"></span>Share</button>