Update default.html

Author: ThePoetCoder

_layouts/default.html

@@ -21,7 +21,7 @@
   <div class="wrapper">
     <header>
       <div id="container">
-        <img src="https://thepoetcoder.github.io/assets/images/tpc.png"/>
+        <img src="https://thepoetcoder.github.io/assets/images/tpc.png" width=100% height=auto/>
       </div>
     </header>
     <div id="container">