css - web page width and height is smaller in mac pc than windows pc -


is px different mac pc , windows pc. how can set same size both mac , windows

   css        .div         {          width: 900px;          height: auto;          margin-left:auto;          margin-right:auto;          margin-top: 1px;          border: 0px solid #a3a3a3;          overflow: hidden;          background-color:#ffffff;         }


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