Update style/defaults/style.css

style/defaults/style.css

@@ -268,6 +268,7 @@ progress::-moz-progress-bar {
   position: relative;
   width: 100%;
 }
+/* --- FIX: Perfectly center the tooltip close button (×) on all devices --- */
 .tooltip-close {
   position: absolute;
   top: -8px;
@@ -277,7 +278,14 @@ progress::-moz-progress-bar {
   border-radius: 50%;
   width: 20px;
   height: 20px;
-  line-height: 20px;
+
+  /* New for centering: */
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 0;
+  line-height: normal;
+
   text-align: center;
   cursor: pointer;
   font-weight: bold;