NppExec_Manual: trying to improve the mobile layout

Author: d0vgan

docs/NppExec_Manual/main_layout.css

@@ -1,15 +1,22 @@
+*, *::before, *::after {
+  box-sizing: border-box;
+}
+
 body, html {
   margin: 0;
   padding: 0;
   height: 100%;
+  width: 100%;
   overflow: hidden; /* Avoiding double-scrolling */
+  position: fixed; /* Improves iOS compatibility */
   font-family: sans-serif;
 }
 
 .container {
   display: flex;
   width: 100%;
-  height: 100vh;
+  height: 100vh; /* Fallback for old browsers  */
+  height: 100dvh;
   flex-direction: row;
 }