Add default value for number of sides input value

Author: lulunac27a

index.html

@@ -22,6 +22,7 @@ <h1>Dice Game Web App</h1>
             placeholder="Enter number of sides"
             min="1"
             step="1"
+            value="6"
             required
         /><br />
         <!--button to roll dice--><button onclick="rollDice()">Roll Dice</button