#ex-1 {
    text-decoration: underline;
    font-weight: bold;
}
#ex-2 {
    line-height: 180%;
    font-size: 10px; font-size: 1.0rem; font-size: 2.666vw;
    margin-top: 6px; margin-top: 1.6vw;
}

#ex3 {
    margin: 16px 0 32px 0; padding-top: 4.266vw; padding-bottom: 8.533vw;
    table-layout: fixed;
}
#ex3 td {
    vertical-align: top;
    border: solid 1px #000;
    padding: 10px 14px; padding-top: 2.666vw; padding-bottom: 2.666vw; padding-right: 3.733vw; padding-left: 3.733vw;
    width: 50%;
}
#ex3 .td-img {
    vertical-align: middle;
    padding: 8px; padding-top: 2.133vw; padding-right: 2.133vw; padding-bottom: 2.133vw; padding-left: 2.133vw;
}
#ex3 td img {
    margin: 0;
}

@media screen and (min-width: 768px) {
    #ex-2 {
        font-size: 10px; font-size: 1.1rem;
        margin-top: 3px;
    }

    #ex3 {
        margin: 16px 0 40px 0;
    }
    #ex3 td {
        padding: 10px 16px;
        width: auto;
    }
    #ex3 .td-img {
        padding: 0;
    }
    #ex3 td img {
        width: 240px
    }
}