body { padding: 1em; }

header { height: 3em; background-image: url(Images/mob-logo.png); background-repeat: no-repeat; background-position: center center; }

h2 { color: #602574; }

.container { margin: 1em; }

@media screen and (min-width: 768px) {

    header { height: 6em; background-image: url(Images/logo.png); background-position: left center; }

    .container { width: 600px; margin: auto; }
}