body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #0073e6;
    padding: 15px;
    color: white;
}

header .logo {
    font-size: 24px;
    font-weight: bold;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}

nav ul li {
    margin: 0 15px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-size: 18px;
}

/* Unit Conversion Buttons */
.unit-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    padding: 20px;
}

.unit-buttons a {
    display: block;
    text-align: center;
    background: #0073e6;
    color: white;
    padding: 15px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
}

.unit-buttons a:hover {
    background: #005bb5;
}

/* Footer */
footer {
    text-align: center;
    background: #0073e6;
    color: white;
    padding: 15px;
    margin-top: 20px;
}