:root {
    --primary-color: rgba(81, 255, 183, 0.541);
}

.pc-row {
    display: flex;
    justify-content: center;
}


.logo>a {
    text-shadow: 2px 2px 3px var(--primary-color);
}

/* フッター */
footer {
    padding-bottom: 10px;
    color: white;
}

footer {
    background-color: rgba(56, 85, 27, 0.788);
}

footer>div>ul>li>a {
    color: white;
}


mark.highlight {
    background: linear-gradient(transparent 60%, var(--primary-color) 60%);

    font-size: 1.14em;
}

.border-study {
    border-color: var(--primary-color);
}

@media screen and (max-width:600px) {
    .pc-row {
        flex-direction: column;
    }

    .study-header {
        font-size: 1.3em !important;
    }
}

@media screen and (min-width:601px) {
    .study-header {
        font-size: 1.7em !important;
    }
}