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

.layout {
    width: 98%;
    margin: 20px auto;
}

    .layout .main {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
        display: flex;
        flex-direction: row;
        flex-wrap: wrap;
    }

        .layout .main .content {
            width: 75%;
        }

        .layout .main .sidebar {
            width: 25%;
        }