button,input,checkbox,textarea {
    outline: 0;
    margin: 0;
}

@media only screen and (-webkit-min-device-pixel-ratio: 1.5), only screen and (-o-min-device-pixel-ratio:3/@media all and (orientation:portrait) {
    #wrapper {
        max-width:640px;
        margin: 0 auto;
    }
}

@media all and (orientation: landscape) {
    #wrapper {
        max-width:640px;
        margin: 0 auto;
    }
}