.postcard
{
background-image: url('https://i.pinimg.com/474x/81/5c/75/815c75d2e4f1dcde918a8030ba01ebf5.jpg');
background-sixe: cover;
background-repeat: no-repeat;
width: 450px;
height: 250px;
filter: drop shadow(0px 8px 15px rgba(0, 0, 0, 0.3)):