body, html {
    margin: 0;
    padding: 0;
    font-family: 'Arial', sans-serif;
    background-color: #f0f0f0; /* Ensuring the body has a background color */
    color: #333; /* Text color */
}

header {
    background-color: #282c34;
    color: #ffffff;
    padding: 1rem;
    text-align: center;
    font-size: 24px;
    border-bottom: 5px solid #ff8c00;
}

nav {
    background-color: #1c1f26;
    display: flex;
    justify-content: center;
    padding: 0.5rem 0;
}

nav a {
    color: #ffffff;
    padding: 10px 15px;
    text-decoration: none;
    font-size: 16px;
    transition: background-color 0.3s;
}

nav a:hover, nav a:focus {
    background-color: #ff8c00;
    outline: none;
}

.container {
    padding: 20px;
    width: calc(100% - 40px);
    max-width: 800px;
    margin: 20px auto;
    background-color: #ffffff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    border-radius: 8px;
}

h1 {
    color: #ffffff;
}
h2 {
    color: #333;
}

.button {
    background-color: #ff8c00;
    color: white;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    text-transform: uppercase;
    border-radius: 4px;
    font-size: 16px;
}

.button:hover {
    background-color: #e07c00;
}

.section {
    padding: 20px;
    margin-bottom: 20px;
    border-left: 5px solid #ff8c00;
    background-color: #fafafa;
}

.result {
    margin-top: 20px;
    font-size: 1.2em;
    font-weight: bold;
}

input[type="number"], select {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    box-sizing: border-box;
    border: 1px solid #ccc;
    border-radius: 4px;
}

input[type="button"] {
    width: auto;
    display: inline-block;
    margin-top: 10px;
}