.grid-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border: none;
}

.grid-item {
    height: 50vh;
    margin-top: 20vh;
    border: 4px solid;
    border-image-slice: 1;
    border-image-source: linear-gradient(to bottom, white 0%, transparent 100%);
}

body {
    background-image: url('https://cdn.britannica.com/62/4562-004-C04E54C5/Flag-Taiwan.jpg');
    background-size: cover;
    background-position: center center;
    background-attachment: fixed;
    margin: 0;
    text-align: center;
}

h2 {
    margin-bottom: -20px;
}

h3 {
    font-size: 120px;
    margin-bottom: -20px;
}

#item1 {
    margin-top: 40vh;
}

#item3 {
    margin-top: 30vh;
}

#nation {
    font-size: 96px;
    margin: 100vh 0 30vh 0;
}