.head {
    background-color: #003344;
    color: white;
    font-weight: bold;
    font-size: 30px;
    text-align: center;
    padding: 10px;
}
.content {
    display: flex;
    justify-content: center;
    align-items: center;
}
.content .box {
    width: 280px;
    padding: 10px;
    margin: 10px;
    background-color: white;
    display: inline-block;
    vertical-align: top;
    text-align: center;
    height: 175px;
    line-height: 30px;
}

@media screen and (max-width:600px) {
    .head {
        font-size: 5vw;
    }
    .content {
        flex-direction: column;
    }
    .content .box {
        width: 80%;
    }
}