diff --git a/src/index.css b/src/index.css
index 1c1e689..9fce51a 100644
--- a/src/index.css
+++ b/src/index.css
@@ -209,6 +209,8 @@ table.form h3 span {
 
 table.form tbody input {
   cursor: pointer;
+  width: 1rem;
+  height: 1rem;
   padding: 0;
   margin: 0;
   position: absolute;