Fix formatting issues

Author: Eilyss

docs/UserGuide.md

@@ -210,9 +210,7 @@ Action        | Format, Examples
   * If within the quotation marks `"` you want to use `\` or `"`, place the character `\` before it to "escape" it, which
     basically tells the program that you want to input these special characters. <br>
     e.g. `add n/"\"Maria del Carmen\" Pérez"` or `add n/Ned d/"This is a backslash \\"`
-<div style=" background: linear-gradient(135deg, #fff3e0, #ffe0b2); border-left: 6px solid #fb8c00; padding: 12px 16px; border-radius: 10px; font-family: 'Segoe UI', system-ui, sans-serif; color: #5d4037; box-shadow: 0 2px 6px rgba(0,0,0,0.1); "> <strong>Warning:</strong> Unclosed quotation marks are not allowed!(i.e. you cannot start with a quotation mark and end with an escaped quotation mark or without a quotation mark at all.)</div>
-
-</box>
+<div style=" background: linear-gradient(135deg, #fff3e0, #ffe0b2); border-left: 6px solid #fb8c00; padding: 12px 16px; border-radius: 10px; font-family: 'Segoe UI', system-ui, sans-serif; color: #5d4037; box-shadow: 0 2px 6px rgba(0,0,0,0.1); "> <strong>Warning:</strong> Unclosed quotation marks are not allowed! You cannot start with a quotation mark and end with an escaped quotation mark or without a quotation mark at all.</div>
 
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