body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

header {
    background-color: #333;
    color: white;
    padding: 0 !important;
}

header nav a {
    color: white;
    margin-right: 1rem;
    text-decoration: none;
}

main {
    padding: 1rem;
    min-height: 450px;
    margin-top: 60px;
}    

.result, .content { margin-top: 10px; }

label { font-weight: bold; }