Adding existing elements of the sign-up page to the class used in the stylesheet

Signed-off-by: Eoghan Conlon <eoghanconlon73@skynet.ie>

src/signup.html

@@ -43,6 +43,7 @@
     <a href="./"><img src="images/sharky_vector_svg.svg" alt="Picture of Sharky, the mascot of skynet" width="145" height="81.56"/> </a>
     <h1>Skynet Password Reset & Sign-up service</h1>
 </div>
+<div class="boxes">
 <h2>Welcome to Skynet</h2>
 <p>
     Skynet is a server cluster that the UL Computer Society runs. If you previously had an account and need to activate <br />
@@ -55,6 +56,7 @@
     <input type="submit" value="Submit"/>
 </form>
 <p id="formStatus"></p>
+</div>
 <footer>
     UL Computer Society 2023-<span id="year">2023</span>
 </footer>