diff --git a/index.html b/index.html
index 843fdac9..a6bb70b9 100644
--- a/index.html
+++ b/index.html
@@ -676,8 +676,8 @@
             <tr data-tip="Set font size">
               <td>Font size</td>
               <td>
-                <button id="styleFontPlus" data-tip="Multiply font size by 1.1" class="whiteButton">+</button>
-                <button id="styleFontMinus" data-tip="Multiply font size by 0.9" class="whiteButton" >-</button>
+                <button id="styleFontPlus" data-tip="Increase font" class="whiteButton">+</button>
+                <button id="styleFontMinus" data-tip="Descrease font" class="whiteButton" >-</button>
                 <input id="styleFontSize" type="number" min=.5 max=100 step=.1 value=14>
               </td>
             </tr>
diff --git a/modules/ui/style.js b/modules/ui/style.js
index 73a4c459..b1c718fd 100644
--- a/modules/ui/style.js
+++ b/modules/ui/style.js
@@ -568,13 +568,13 @@ styleFontSize.addEventListener("change", function () {
 });
 
 styleFontPlus.addEventListener("click", function () {
-  const size = Math.max(rn(getEl().attr("data-size") * 1.1, 2), 1);
-  changeFontSize(size);
+  const size = +getEl().attr("data-size") + 1;
+  changeFontSize(Math.min(size, 999));
 });
 
 styleFontMinus.addEventListener("click", function () {
-  const size = Math.max(rn(getEl().attr("data-size") * 0.9, 2), 1);
-  changeFontSize(size);
+  const size = +getEl().attr("data-size") - 1;
+  changeFontSize(Math.max(size, 1));
 });
 
 function changeFontSize(size) {