refactor: Basic styling for search form. Unnecessary floating deleted.

bin/types/search.css

-
 .quiqqer-products-search-form {
-    float: left;
-    margin-bottom: 30px;
     width: 100%;
+    display: flex;
 }
 
 .quiqqer-products-search-form input[type="search"] {
-    float: left;
-    height: 40px;
-    line-height: 40px !important;
-    max-width: calc(100% - 100px);
-    padding: 0 10px !important;
-    width: 400px;
+    max-width: calc(100% - 50px);
+    flex-grow: 1;
 }
 
 .quiqqer-products-search-form button {
-    border: none;
-    float: left;
-    line-height: 40px !important;
     margin: 0;
-    padding: 0 10px !important;
-    width: 100px;
+    width: 50px;
 }