Expand search functionality to search words as array

app/assets/stylesheets/app/_notes.scss

@@ -35,6 +35,7 @@
     clear: left;
     height: 32px;
     margin-top: 20px;
+    position: relative;
 
     .filter-bar {
       background-color: $light-bg-color;
@@ -48,6 +49,28 @@
 
       border: none;
       width: 100%;
+      position: relative;
+    }
+
+    #search-clear-button {
+      border-radius: 50%;
+      width: 17px;
+      height: 17px;
+      color: white;
+      cursor: default;
+      background-color: gray;
+      font-size: 10px;
+      line-height: 17px;
+      text-align: center;
+      position: absolute;
+      top: 8px;
+      right: 8px;
+
+      transition: background-color 0.15s linear;
+
+      &:hover {
+        background-color: $blue-color;
+      }
     }
   }