* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: #81CACF ;
    font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
    font-weight: 700;
    color: #fff;
    font-size: 1.5rem;
}

.container {
    display: grid;
    height: 100vh;
    gap: 15px;
    padding: 0.5rem;
}

.container > * {
    background-color: #355764;
    display: grid;
    place-items: center;
    padding: 10px;
    border-radius: 1rem;
}

@media screen and (min-width: 56rem) {
    .container {
        grid-template-columns: 150px 1fr;
        grid-template-rows: 50px repeat(2, 1fr) 50px;
        grid-template-areas:
            "header header"
            "sidebar main"
            "sidebar main"
            "sidebar footer";
    }
    .header {
        grid-area: header;
    }
    .sidebar {
        grid-area: sidebar;
    }
    .main {
        grid-area: main;
    }
    .footer {
        grid-area: footer;
    }
}