Update default_about.liquid

Author: sawhney-medha

_layouts/default_about.liquid

@@ -20,9 +20,9 @@
       background-repeat: no-repeat;
       background-size: contain;
       background-position: center center;
-      height: 60em; /* Adjust this if there is white space before the image or if image gets cuts off */
+      height: 100vh; /* Adjust this if there is white space before the image or if image gets cuts off */
       margin-bottom: 2em;
-      margin-top: -2.7em;
+      margin-top: -0.0em;
       width: 100%;
     "></div>
   </div>