body {
    background: whitesmoke;
}

.big-logo-box {
    margin-top: 80px;
}

.big-logo-box img {
    display: block;
    width: 100%;
}

.content-box {
    padding: 80px;
    margin: 160px 240px 50px 240px;
    background: white;
}

.date {
    color: #999;
    font-size: 16px;
}

.title {
    margin-bottom: 30px;
    color: #029898;
    font-size: 24px;
}

.html-box {
    width: 100%;
    overflow: hidden;
    color: #333;
    font-size: 16px;
}

.html-box img {
    display: block;
    max-width: 100%;
    max-height: 100%;
    margin: 0 auto;
}

.btn {
    text-align: center;
    margin: 0 auto 62px auto;
    width: 145px;
    height: 48px;
    line-height: 48px;
    color: white;
    font-size: 16px;
    border-radius: 24px;
    cursor: pointer;
    background: black;
    transition: background-color .5s ease-in-out;
}

.btn:hover {
    background: #029898;
}

@media (max-width: 768px) {
    .big-logo-box {
        margin-top: 57px;
    }

    .content-box {
        padding: 20px;
        margin: 20px;
    }

    .btn {
        margin: 0 auto 31px auto;
    }
}