about.css

body, h1, h2, p, ul, li {
    margin: 0;
    padding: 0;
    filter: brightness(100%);
}

/* Set a background color and text color for the body */
body {
    background: url(https://c4.wallpaperflare.com/wallpaper/557/873/283/abstract-yellow-black-background-wallpaper-preview.jpg);
    color: #333;
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    filter: brightness(100%);
}

/* Style the header section */
header {
    background:url(https://www.onlygfx.com/wp-content/uploads/2020/05/yellow-black-grunge-background-6.jpg);
    color: black;
    text-align: center;
    padding: 20px;
    filter: brightness(100%);
}

header h1 {
    font-size: 2em;
    filter: brightness(100%);
}

nav ul {
    list-style: none;
    filter: brightness(100%);
}

nav li {
    display: inline;
    margin-right: 15px;
    filter: brightness(100%);
}

nav a {
    text-decoration: none;
    color: #fff;
    font-weight: bold;
    filter: brightness(100%);
}

/* Style the main content section */
main {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background: url(https://st5.depositphotos.com/73058584/65910/i/450/depositphotos_659106472-stock-photo-background-yellow-gold-foil-polka.jpg);
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    filter: brightness(100%);
}

/* Style the about sections */
#about-app,
#mission,
#team {
    margin-bottom: 30px;
    filter: brightness(100%);
}

#about-app h2,
#mission h2,
#team h2 {
    color: black;
    border-bottom: 2px solid black;
    padding-bottom: 5px;
    margin-bottom: 15px;
    filter: brightness(100%);
}

/* Style the footer section */
footer {
    text-align: center;
    padding: 10px;
    background: url(https://www.onlygfx.com/wp-content/uploads/2020/05/yellow-black-grunge-background-6.jpg);
    color: #fff;
    position: fixed;
    bottom: 0;
    width: 100%;
    filter: brightness(100%);
}

/* Media query for responsiveness */
@media only screen and (max-width: 600px) {
    main {
        padding: 10px;
        filter: brightness(100%);
    }
}