diff --git a/style/base.css b/style/base.css
index 3436986..98c3046 100644
--- a/style/base.css
+++ b/style/base.css
@@ -1313,3 +1313,18 @@ del {
   transition: background-color 0.3s, transform 0.2s;
   z-index: 20;
 }
+
+.controlSpan {
+  border-radius: 8px;
+  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-family: 'd9', sans-serif;
+  font-size: 16px;
+  height: 30px;
+  width: 30px;
+  transition: background-color 0.3s, transform 0.2s;
+  z-index: 20;
+}
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