* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: #ffffff;
    color: #444;
    font-family:
        "Noto Sans JP",
        "Hiragino Sans",
        "Yu Gothic",
        sans-serif;
    line-height: 2;
    font-size: 17px;
    color: #504646;
}

/* .top-border {
    height: 6px;
    background: #c62828;
} */

.top-border {
    height: 6px;
    background: linear-gradient(
        90deg,
        #8B0000 0%,
        #C62828 50%,
        #8B0000 100%
    );
}

.container {
    max-width: 760px;
    margin: 0 auto;
    padding: 70px 30px 100px;
}

.logo {
    text-align: center;
    font-size: 42px;
    font-weight: 300;
    color: #c62828;
    letter-spacing: 0.08em;
    margin-bottom: 60px;
}

h1 {
    text-align: center;
    font-size: 32px;
    font-weight: 500;
    line-height: 1.8;
    margin-bottom: 60px;
}

.content {

}

.content p {
    margin-bottom: 28px;
}

.signature {
    text-align: right;
    margin-top: 50px;
}

.btn {
    display: block;
    width: 400px;
    margin: 70px auto 0;
    padding: 16px 20px;

    background: #c62828;
    color: #fff;
    text-decoration: none;
    text-align: center;

    border-radius: 9999px;

    font-weight: 600;
    transition: all .2s ease;
}

.btn:hover {
    background: #b71c1c;
}

@media (max-width: 768px) {

    .container {
        padding: 40px 20px 70px;
    }

    .logo {
        font-size: 32px;
        margin-bottom: 40px;
    }

    h1 {
        font-size: 22px;
        margin-bottom: 40px;
    }

    .content {
        font-size: 14px;
    }

    .btn {
        width: 100%;
        font-size: 14px;
    }
}