The link to your sedan icon is broken (which looks like it's also causing an alignment issue in your webpage).
I'd also explore using a flex-box or bootstrap framework to display this. It would make it easier to center the row of cards horizontally. It would also help with the responsive layout.
Because you set those cards to inline-block you have an awkward layout between the mobile and desktop views. On a tablet or medium size window the sedan and suv sections each take up half a row, but the luxury card has the same dimensions but is centered on its own row. You could use bootstrap or flexbox with a media query to get a better responsive layout.
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