diff --git a/index.html b/index.html
index e76fd11238e1b177e24fc2fdd462e5bdab7e9f2b..db104d009f47532bc3ed3fcbdd304433b72c4496 100644
--- a/index.html
+++ b/index.html
@@ -18,8 +18,8 @@
         <h1>OhmPi Acquisition Board</h1>
         <!-- nb stacks, on-time -->
         <button id="update_settingsBtn" type="button" class="btn btn-secondary" data-toggle="modal" data-target="#exampleModal">Settings</button>
-        <button id='runBtn' type="button" class="btn btn-primary">Run</button>
-        <button id='stopBtn' type="button" class="btn btn-warning">Interrupt</button>
+        <button id='runBtn' type="button" class="btn btn-primary">&#9654</button>
+        <button id='stopBtn' type="button" class="btn btn-warning">&#9724</button>
         <!-- upload button for csv which display the table ABMN -->
         <button id="removeDataBtn" type="button" class="btn btn-danger">Clear data</button>
         <button id="getDataBtn" type="button" class="btn btn-info">Get data</button>