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

/* Global styles */
body {
    font-family: 'Helvetica Neue', sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: #333;
}

header {
    background-color: #1e88e5;
    padding: 20px;
    position: relative;
}

header a {
    color: #fff;
    text-decoration: none;
}

main {
    padding: 20px;
}

.about {
    max-width: 800px;
    margin: 0 auto;
}

.center {
    text-align: center;
}

footer {
    background-color: #f2f2f2;
    padding: 20px;
    text-align: center;
}

/* Back button styles */
.back-button {
    position: absolute;
    top: 20px;
    left: 20px;
    padding: 10px;
    font-size: 24px;
    color: #fff;
    text-decoration: none;
}

.back-button i {
    margin-right: 5px;
}