style.css

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

.container {
    display: grid;
    grid-template-areas: 
        "nav header header"
        "nav main cards";
    grid-template-columns: 200px 1fr 200px;
    grid-template-rows: 80px 1fr;
    min-height: 100vh;
    gap: 10px;
    box-sizing: border-box;
}

.header {
    grid-area: header;
    background-color: #2196F3;
    color: white;
    padding: 20px;
    display: flex;
    align-items: center;
}

.nav {
    grid-area: nav;
    background-color: #f0f0f0;
    padding: 20px;
}

.main {
    grid-area: main;
    background-color: #ffffff;
    padding: 20px;
    border: 1px solid #ddd;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, 200px); 
    gap: 20px;
}

.main-card {
    background-color: #f0f0f0;
    padding: 20px;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

@media (max-width: 768px) {
    .main {
        grid-template-columns: 1fr;
        grid-template-rows: repeat(6, auto);
    }
}

.cards {
    grid-area: cards;
    display: grid;
    grid-template-rows: 1fr 1fr;
    gap: 10px;
}

.card1, .card2 {
    background-color: #f0f0f0;
    padding: 20px;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Make it responsive */
@media (max-width: 768px) {
    .container {
        grid-template-areas: 
            "nav"
            "header"
            "main"
            "cards";
        grid-template-columns: 1fr;
        grid-template-rows: auto;
    }

    .cards {
        grid-template-rows: auto auto;
    }
}