body{ margin:0; padding:0}
.theme-default #slider {
    margin:0px;
    padding:0;
    width:801px; 
    height:235px; 
}

@media only screen and (max-width: 450px)
{
    .theme-default #slider {
    margin:0px auto 0 auto;
    width:322px; 
    height:274px; 
}
}