.page-title {
    color: black;
    font-size: 48px;
    text-align: center;
}

body {
    margin: 0;
    font-family: Meiryo, system-ui;
    font-size: 20px;
}

.main {
    text-align: center;
}

a {
    color: #0000ff;
    text-decoration: none;
}

a:hover {
    color: #ff0000;
    text-decoration: underline;
}

.footer {
    background-color: #efefef;
    padding: 26px 28px;
    text-align: center;
}

.red-text {
    color: #ff0000;
    font-size: 30px;
}

.copyright {
    font-size: 14px;
}

@media screen and (max-width:768px) {
    .kotira {
        width: 75%;
        height: auto;
    }
}