revert css changes

Author: chenxsan

packages/docsearch-css/src/button.css

@@ -12,7 +12,6 @@
   margin: 0 0 0 16px;
   padding: 0 8px;
   user-select: none;
-  min-width: 155px;
 }
 
 .DocSearch-Button:hover,
@@ -63,10 +62,6 @@
 }
 
 @media (max-width: 750px) {
-  .DocSearch-Button {
-    min-width: auto;
-  }
-
   .DocSearch-Button-KeySeparator,
   .DocSearch-Button-Key {
     display: none;