added US AQI subtitle to cloud to make it obvious

frontend/nginx/css/style.css

@@ -163,6 +163,10 @@ a {
     margin: 0;
 }
 
+.aqi_box p {
+    margin: 0;
+}
+
 /* weather styling */
 .block_wrap {
     margin-bottom: 40px;

frontend/nginx/index.php

@@ -26,6 +26,7 @@
                 <img src="/img/cloud.png" alt="cloud" class="col_filter">
                 <div class="aqi_box">
                     <h1 id="aqiValue"></h1>
+                    <p id="aqi-label">US AQI</p>
                     <h2 id="aqiCategory"></h2>
                 </div>
             </div>