diff --git a/src/index.html b/src/index.html
index 8673391..f0c4d67 100644
--- a/src/index.html
+++ b/src/index.html
@@ -36,7 +36,7 @@
                 <label for="password">Password</label>
                 <input type="password" id="password" name="password" required>
 
-                <input id="login__submit" type="submit" value="Log in" role="button">
+                <input id="login__submit" class="btn-primary" type="submit" value="Log in" role="button">
 
                 <p class="login__error-msg hide" role="alert">Invalid login attempt</p>
                 <!-- if login is invalid remove "hide" class to pop error -->