body {
    margin: 0;
    padding: 20px 0;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    font-family: Arial, sans-serif;
}

.container {
    width: 70%;
    display: grid;
    grid-template-columns: 25% 75%;
    grid-template-rows: auto auto auto;
    gap: 10px;
}

.header {
    grid-column: 1 / 3;
    background-color: green;
    color: white;
    padding: 20px;
    text-align: center;
}

.left {
    background-color: blue;
    color: white;
    padding: 20px;
}

.right {
    background-color: red;
    color: white;
    padding: 20px;
}

.footer {
    grid-column: 1 / 3;
    background-color: black;
    color: white;
    padding: 20px;
    text-align: center;
}