diff --git a/_includes/head.html b/_includes/head.html
index fd37631edc..fa581d23da 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -1,6 +1,6 @@
 <head>
     <meta charset="utf-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
+    <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=0.5, maximum-scale=5">
 
     <!-- Main JS (navbar.js, katex_init.js and masonry_init.js)-->
     <script defer src="{{ '/assets/js/main.min.js' | relative_url }}"></script>
diff --git a/_includes/post_info.html b/_includes/post_info.html
index b555ed657e..0cd02af43f 100644
--- a/_includes/post_info.html
+++ b/_includes/post_info.html
@@ -4,7 +4,7 @@
 <div class="post-info">
   {%- if author.url -%}<a href="{{ author.url | relative_url }}" target="_blank">{%- endif -%}
     {% if author.avatar  %}
-      <img src="{{ author.avatar | relative_url }}">
+      <img alt="Author's avatar" src="{{ author.avatar | relative_url }}">
     {% endif %}
     <p class="meta">
       {% if author.name %}{{ author.name }} - {% endif %}{{ date | date: "%B %-d, %Y" }}
