move the index/login box on RevCMS

[throneme]

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you see the login box is on the right how will I place it in the centre?

 

[Vui]

#main_login {
width: 230px;
margin-left: auto;
background: white;
padding: 10px;
border: #E1E1E1 1px solid;
margin-right: auto;
}