diff --git a/timer/index.html b/timer/index.html
index 1e6a58d..05defb7 100644
--- a/timer/index.html
+++ b/timer/index.html
@@ -572,7 +572,10 @@
           <button class="preset-btn" type="button" data-sec="300">5 min</button>
           <button class="preset-btn" type="button" data-sec="600">10 min</button>
           <button class="preset-btn" type="button" data-sec="900">15 min</button>
+          <button class="preset-btn" type="button" data-sec="1200">20 min</button>
           <button class="preset-btn" type="button" data-sec="1500">25 min</button>
+          <button class="preset-btn" type="button" data-sec="1800">30 min</button>
+          <button class="preset-btn" type="button" data-sec="2700">45 min</button>
           <button class="preset-btn" type="button" data-sec="3600">1 hour</button>
           <button class="preset-btn" type="button" data-sec="5400">1 hr 30 min</button>
           <button class="preset-btn" type="button" data-sec="7200">2 hours</button>