#contents h3 {
    font-size: max(22pt, 2vw);
    margin-bottom: .5em;
}

#contents .plan {
    text-align: center;
    margin-block: 1em;
}

#contents .plan > ul {
    display: inline-block;
    border: 1px solid var(--main-color);
    padding: 1em 1.5em;
}
#contents .plan > ul li {
    color: var(--main-color);
    font-size: 110%;
    font-weight: bold;
    text-align: left;
}
#contents .plan > ul li s span {
    color: #9a9a9a;
    margin-right: .5em;
}

@media screen and (max-width: 430px){
    #contents .plan > ul {
        padding: .5em;
    }
}