:root {
    --mainColor: #304D80;
}

* {
    margin: 0;
    padding: 0;
}

html, body, div {
    font-family: 'Sarabun';
}

html, body {
    font-size: 18px;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--mainColor);
    margin: 0;
    height: 100vh;
    background-attachment: fixed;
}

.card-body {
    margin: 1.5px;
    background: #fff;
    display: block;
    justify-content: center;

}

.card-title {
    background-color: #1e304f;
    padding: 8px 0;
    color: #fff;
    text-align: center;
    border-radius: 5px;
}

.card1, .card2 {
    width: 18rem;
}

.card1 {
    margin-right: 30px;
}

.card2 {
    margin-left: 30px;
}

.hltext {
    color: red;
}

@media screen and (max-width: 767px) {
    html, body {
        font-size: 16px;
    }

    body {
        display: flex;
        justify-content: center;
        align-items: center;
    }

    .card1 {
        margin-right: 15px;
    }
    
    .card2 {
        margin-left: 15px;
    }
}

@media screen and (max-width: 435px) {
    .card1, .card2 {
        width: 14rem;
        margin: 0;
        font-size: 14px;
    }

    .card1 {
        padding-bottom: 10px;
        margin-bottom: 10px;
        margin-right: 0px;
    }

    .card2 {
        padding-top: 10px;
        margin-top: 10px;
        margin-left: 0px;
    }
}