Update media query from min-width to max-width

This commit updates the CSS media query screen size from a minimum width of 768px to a maximum width of 768px. This change improves the responsive design for smaller devices.

style/style.css

@@ -134,7 +134,7 @@ body {
     margin-top: -125px;
 }
 
-@media only screen and (min-width: 768px) {
+@media only screen and (max-width: 768px) {
     .user-image {
         width: 180px;
         margin-top: -90px;