.about-power ul {
    display: flex;
    flex-wrap: wrap;
}
.about-power ul li {
    width: 25%;
    text-align: center;
    border-right: 1px solid #f1f1f1;
}
.about-power ul li:last-child {
    border-right: none;
}
.about-power ul li h3 {
    font-size: 2.5rem;
    margin: 20px 0;
}
.about-power ul li h3 sup {
    font-size: 0.8rem
}

@media (max-width: 480px) {
    .about-power ul li {
        width: 50%;
    }
    .about-power ul li:nth-child(2n) {
        border-right: none;
    }
}