body {
    background-color: #f5f5f5;
    margin: 0;
}

.wrapper {
    max-width: 900px;
    margin: 2rem auto;
    width: 100%;
    background: #fff;
    padding: 2rem;
    border-radius: 6px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

header {
    float: none;
    position: static;
    width: 100%;
    padding-top: 1.5rem;
    text-align: center;
    margin-bottom: 2rem;
}

section {
    float: none;
    width: 100%;
    padding-top: 0;
    padding-bottom: 2rem;
}

footer {
    float: none;
    position: static;
    width: 100%;
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
}