Fix up search bar on mobile

_layouts/default.html

@@ -19,7 +19,7 @@
         <div class="main-content pb-0">
           <div class="search js-search">
             <div class="search-input-wrap">
-              <input type="text" class="js-search-input search-input fs-2" placeholder="Search {{ site.title }}" aria-label="Search {{ site.title }}" autocomplete="off">
+              <input type="text" class="js-search-input search-input" placeholder="Search {{ site.title }}" aria-label="Search {{ site.title }}" autocomplete="off">
               <svg width="14" height="14" viewBox="0 0 28 28" xmlns="http://www.w3.org/2000/svg" class="search-icon"><title>Search</title><g fill-rule="nonzero"><path d="M17.332 20.735c-5.537 0-10-4.6-10-10.247 0-5.646 4.463-10.247 10-10.247 5.536 0 10 4.601 10 10.247s-4.464 10.247-10 10.247zm0-4c3.3 0 6-2.783 6-6.247 0-3.463-2.7-6.247-6-6.247s-6 2.784-6 6.247c0 3.464 2.7 6.247 6 6.247z"/><path d="M11.672 13.791L.192 25.271 3.02 28.1 14.5 16.62z"/></g></svg>
             </div>
             <div class="js-search-results search-results-wrap"></div>

_sass/search.scss

@@ -7,10 +7,11 @@
   z-index: 99;
   display: none;
   flex-grow: 1;
-  padding-bottom: $gutter-spacing / 2;
-  background-color: $white;
   padding: $sp-2;
   margin-bottom: $sp-3;
+  background-color: $white;
+  border-radius: 3px;
+  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.07), 0 3px 10px rgba(0, 0, 0, 0.05);
 
   @include mq(md) {
     display: block;
@@ -20,6 +21,7 @@
     padding-left: 0;
     margin-bottom: 0;
     background-color: transparent;
+    box-shadow: none;
   }
 
   &.nav-open {
@@ -65,6 +67,16 @@
       fill: $purple-000;
     }
   }
+
+  @include fs-5;
+
+  @include mq(sm) {
+    @include fs-3;
+  }
+
+  @include mq(md) {
+    @include fs-2;
+  }
 }
 
 .search-icon {