diff --git a/lib/extensions/admin/login/css/main.css b/lib/extensions/admin/login/css/main.css
index 69414f2..cf705ec 100644
--- a/lib/extensions/admin/login/css/main.css
+++ b/lib/extensions/admin/login/css/main.css
@@ -85,7 +85,7 @@ button {
     margin: 1em 0;
 }
 
-button[disabled=true] {
+button:disabled {
     background-color: #d9d9d9;
 }
 
diff --git a/lib/extensions/admin/login/js/app.js b/lib/extensions/admin/login/js/app.js
index fdd4537..9751129 100644
--- a/lib/extensions/admin/login/js/app.js
+++ b/lib/extensions/admin/login/js/app.js
@@ -129,6 +129,20 @@ function init() {
     console.log(pair);
     submitCode(pair);
   });
+
+  var formElements = document.querySelector('.js-submit').elements;
+  for(var i = 0; i < formElements.length; ++i) {
+    var tosCheck = document.querySelector('[name=telebit-agree]');
+    var leCheck = document.querySelector('[name=letsencrypt-agree]');
+    var pairCodeInput = document.querySelector('[name=pair-code]');
+    formElements[i].addEventListener('input', function(ev) {
+      if(tosCheck.checked && leCheck.checked && pairCodeInput.value.length) {
+        document.querySelector('.js-submit button').disabled = false;
+      } else {
+        document.querySelector('.js-submit button').disabled = true;
+      }
+    });
+  };
 }
 
 window.fetch('https://' + location.hostname + '/_apis/telebit.cloud/index.json', {