Fix search bar css style (closes #23)

1) Making the search bar more large
2) Fix the input field height to be aligned with search button
3) Set the search icon in the middle of the search button
diff --git a/site/src/site/pages/search.groovy b/site/src/site/pages/search.groovy
index 6a6d061..30183e6 100644
--- a/site/src/site/pages/search.groovy
+++ b/site/src/site/pages/search.groovy
@@ -31,7 +31,7 @@
                                 'gcse:search'(linkTarget: '_blank'){}
                                 style '''
                                     .gsc-input-box {
-                                        height: 30px;
+                                        height: auto;
                                     }
                                     input.gsc-search-button, input.gsc-search-button-v2 {
                                         height: 30px;
@@ -66,7 +66,13 @@
                                         width: 120px !important;
                                     }
                                     td.gsc-search-button {
-                                        padding-top: 6px;
+                                        padding-top: 0;
+                                    }
+                                    button.gsc-search-button.gsc-search-button-v2 > svg {
+                                        vertical-align: middle;
+                                    }
+                                    div.gsc-control-cse.gsc-control-cse-en {
+                                        padding: 0;
                                     }
                                     td.gsc-orderby-container {
                                         padding-right: 20px;