body {
    margin: 0;
}

.container {
    display: grid;
    grid-template-areas:
    'header header header'
    'sidebar main main'
    'footer footer footer';
    grid-template-rows: 60px 1fr 40px;
    grid-template-columns: 230px 1fr;
    height: 100vh;
}

.header {
    grid-area: header;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
}

.menu-btn {
    display: none;
}

.sidebar {
    grid-area: sidebar;
    padding: 20px;
    overflow-y: auto;
}

.sidebar-button {
    /*width: 100%;*/
    /*margin: 0;*/
}

.main {
    grid-area: main;
    padding: 20px;
    overflow-y: auto;
}

.footer {
    grid-area: footer;
    background: #efefef;
    color: black;
    display: flex;
    align-items: center;
    justify-content: center;
}

@media (max-width: 768px) {
    .container {
        grid-template-areas:
      'header'
      'main'
      'footer';
        grid-template-rows: 60px 1fr 40px;
        grid-template-columns: 1fr;
    }

    .sidebar {
        display: none;
    }

    .menu-btn {
        display: block;
    }
}