.post {
    background-image: url("indexcard.png");
    background-repeat: no-repeat;
    background-size: cover;
    text-align: center;
    top: 10px;
    bottom: 610px;
    background-position: center;
    height: 500px;
    width: 600px;
    flex: 1;
    margin: 10px;
}

.container { 
    display: flex;
    flex-direction: column;
}