Changed to the solution proposed by @k-takata

Author: h-east

style.css

@@ -17,6 +17,7 @@
 div#SearchForm {
     float: right;
     width: 200px;
+    margin-top: -1em;
 }
 
 body {
@@ -29,7 +30,6 @@ body {
 
 h1, h2, h3 {
     margin: 1em;
-    white-space: nowrap;
 }
 .Todo {
     color: #0000ff;