Better prompt layout (no accidental scrollbar).

Author: hackademix

src/ui/prompt.css

@@ -42,7 +42,7 @@ html.mobile > body {
 #main {
   display: flex;
   flex-direction: column;
-  align-items: center;
+  align-items: stretch;
   padding: 0 1.6em;
   top: 0;
   left: 0;
@@ -53,7 +53,6 @@ html.mobile > body {
 }
 #message {
   flex-grow: 1;
-  width: 100%;
   max-height: 28em;
   padding: .8em;
   text-align: center;
@@ -98,7 +97,6 @@ html.mobile > body {
 }
 
 #buttons {
-  width: 100%;
   display: flex;
   flex-grow: 0;
   flex-direction: row;