index.css

body {
    height: 100vh;
    margin: 0;
    padding: 0;
    background-color: #000;
}

#container {
    display: flex;
    width: 100%;
    height: 100%;
}

.card {
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
    border-radius: 15px;
    margin: 5px;
    flex: 1;
    cursor: pointer;
    outline: none;
}

.card_1 {
    background-image: url("https://images.unsplash.com/photo-1611785677708-128fc827a1e0?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=2000&q=100");
}

.card_2 {
    background-image: url("https://images.unsplash.com/photo-1608216601876-f3623092e9ea?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=2000&q=100");
}

.card_3 {
    background-image: url("https://images.unsplash.com/photo-1490641815614-b45106d6dd04?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=2000&q=80");
}

.card_4 {
    background-image: url("https://images.unsplash.com/photo-1580414057403-c5f451f30e1c?ixid=MnwxMjA3fDB8MHxzZWFyY2h8MTZ8fHNwb3J0cyUyMGNhcnxlbnwwfHwwfHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=2000&q=100");
}

.card_5 {
    background-image: url("https://images.unsplash.com/photo-1539720473538-74cabbc4f113?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=2000&q=80");
}

.card_6 {
    background-image: url("https://images.unsplash.com/photo-1606220838299-9f4e1c67020b?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=2000&q=80");
}

.card_active {
    flex: 10;
}