diff --git a/web/kiri/index.css b/web/kiri/index.css
index 654d5abe..ed24796a 100644
--- a/web/kiri/index.css
+++ b/web/kiri/index.css
@@ -950,6 +950,7 @@ th, tr, td, label {
     transform: translateX(50%) translateY(-50%);
     right: 50%;
     top: 50%;
+    max-height: 80%;
 }
 .mdialog {
     display: none;
@@ -965,6 +966,9 @@ th, tr, td, label {
     border-top-right-radius: 10px;
     background-color: var(--main-color);
 }
+#tool-cols {
+    max-height: 350px;
+}
 #mod-x {
     position: absolute;
     z-index: 30;
diff --git a/web/kiri/index.html b/web/kiri/index.html
index 31327455..019cb0e8 100644
--- a/web/kiri/index.html
+++ b/web/kiri/index.html
@@ -373,7 +373,7 @@
                             <div class="t-pad"></div>
                             <label class="t-33" lk="view">view</label>
                         </div>
-                        <div class="f-row">
+                        <div id="tool-cols" class="f-row">
                             <div class="f-col t-33">
                                 <select id="tool-select" size="10" class="grow"></select>
                             </div>