body {
    margin: 0;
    padding: 0;
    background: #fff;
    color: #000;
    font-family: Helvetica, Arial;
    text-align: center;
}

header {
    background: linear-gradient(to left, #f0f5fe, #6d9ff8);
}

.logo img {
    width: 120px;
}

header {
    border-bottom: 1px solid #f0f5fe;
}

.mainContent {
    text-align: left;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

h1, h2, h3 {
    color: #555;
}

h2, h3 {
    font-weight: normal;
}

.mainContent h1 {
    border-bottom: 1px solid #999;
}

.mainContent h1:not(:first-child) {
    padding-top: 1em;
}

footer {
    border-top: 1px solid #f0f5fe;
    color: #8a8a8a;
}

.appstore img {
    width: 160px;
}

@media (prefers-color-scheme: dark) {
    header {
        background: #555;
    }

    body {
        background-color: #333;
    }

    body {
        color: #ddd;
    }

    h1, h2, h3 {
        color: #ddd;
    }
    
    a {
        color: white;
    }
    
    header {
        border-bottom: 1px solid gray;
    }

    footer {
        border-top: 1px solid gray;
    }

}