Box won't stretch from left to right. Obstacle?

[Everton]

Hello

I have a Web page here: http://www.dimadayoub.net/forgot.aspx and, when a user completes the email field, he gets an onscreen message to say an email has been sent to him. This message is generated by the following CSS:

.resetSent {
color: #F66;
text-align: center;
border: 1px solid #05C6FC;
-webkit-border-radius: 1em;
border-radius: 1em;
padding: 1.5em;
margin: 4em 10em 0 3em; /* adjust to push away from “Send” */
display: block;
}

If possible, I would prefer that message to appear in the same blue-bordered box, but on one line the stretched from one side to the other, rather than being stranded on the left. I have tried to achieve this, but something is preventing it.

Thanks for any advice.

[Shikkediel]

No such message is appearing when entering a random email address…

[Author]

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