/* CSS Variables */
:root {
    --primary-color: #0288d1;
    --secondary-color: #0277bd;
    --background-color: #e0f7fa;
    --text-color: #333;
    --white: #ffffff;
    --font-family: 'Fira Code', Arial, sans-serif;
}
/* General settings */
.header {
    background-color: var(--primary-color);
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}
.main {
    padding: 20px;
}
.aside {
    padding: 20px;
    background-color: #e1f5fe;
}

.footer {
    background-color: var(--primary-color);
    padding: 20px;
    text-align: center;
    color: var(--white);
    margin-top: 20px;
    box-shadow: 0 -2px 4px rgba(0, 0, 0, 0.1);
}