html,
body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background-color: #a1bead;
    font-size: 20px;
}

body.content {
    background-color: #fff;
}

.logo {
    width: 300px;
    height: auto;
    display: block;
    margin: 0 auto 20px auto;
}

.intro-page {
    height: 100vh;
    width: 80%;
    margin: 0 auto;
}

.intro-page>div {
    display: flex;
    justify-content: center;
    align-items: center;
}

.intro-page>div div {
    padding: 50px;
    border-radius: 10px;
    width: 50%;
}

.page {
    display: flex;
    gap: 20px;
}

.page>div:first-child {
    background-color: #a1bead;
    height: 300px;
}

.page>div.content {
    padding: 50px;
    width: 75%;
    margin: 0 auto;
}

.w-75 {
    width: 75%;
    margin: 0 auto;
}

.w-50 {
    width: 50%;
    margin: 0 auto;
}

.button {
    display: inline-block;
    padding: 10px 20px;
    background-color: transparent;
    border: 1px solid #333;
    ;
    color: #333;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

footer {
    text-align: center;
    padding: 20px;
    color: #333;
    margin-top: 50px;
}

footer.inner {
    width: 90%;
    margin: 0 auto;
}
footer.inner div {
    text-align: center;
}

footer ul {
    font-size: 10px;
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    gap: 20px;
    justify-content: center;
}

footer.inner ul {
    display: block;
}

footer a {
    color: #333;
    text-decoration: none;
}

footer img {
    width: auto;
    height: 50px;
}

.flex {
    display: flex;
    gap: 20px;
}

.topic {
    margin-top: 50px;
}

.topic ul li {
    margin-bottom: 15px;
}



.w-400 {
    width: 400px;
    height: auto;
}

@media screen and (max-width: 768px) {
    .intro-page>div div {
        width: 100%;
        padding: 20px;
    }

    .page {
        flex-direction: column;
    }

    .page>div.content {
        width: 85%;
        padding: 20px;
    }

    .logo {
        margin-top: 20px;
        width: 100%;
        height: auto;
    }

    .intro-page>div {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
    }

    .intro-page h1 {
        font-size: 24px;
    }

    .flex {
        flex-direction: column;
    }
    .w-400 {
        width: 90%;
        height: auto;
    }
    .topic {
        font-size: 16px;
        width: 90%;
    }   
    footer {
        width: auto;
        margin: 50px 25px;
    }
    footer ul {
        display: flex;
        justify-content: center;
    };
}