body {
    background-color: #074f57;
    font-family: sans-serif;
    margin: 20px;
}

.container {
    background-color: #fff;
    max-width: 700px;
    margin: auto;
}

header img {
    width: 100%;
}

section {
    padding: 10px;

    display: flex;
    flex-wrap: wrap;
}

footer {
    font-size: 6px;
    text-align: center;
    color: gray;
    padding: 10px;
}

.product {
    flex: 0 0 33.333333%;
    max-width: 33.333333%;
}

.details {
    flex: 0 0 50%;
    max-width: 50%;
}

.grid-box {
    position: relative;
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
    padding-bottom: 15px;
    box-sizing: border-box;
}

.grid-box img {
    max-width: 100%;
}

/* mobile mode */
/*@media only screen and ((orientation : portrait) or (orientation : landscape)) {*/
/*@media only screen and (orientation : portrait) {*/

@media (max-width: 576px) {
    body {
        margin: 0;
    }

    .container {
        max-width: 100%;
    }

    .product {
        flex: 0 0 50%;
        max-width: 50%;
    }
}