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

html, body {
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
    font-family: Arial, sans-serif;
    background: #f5f5f5;
}

.wrapper {
    width: 1130px;
    margin: 0 auto;
    background: #fff;

    flex: 1;
    display: flex;
    flex-direction: column;
}

.header {
    background: #3f51b5;
    color: #fff;
    padding: 20px;
}

.menu {
    background: #303f9f;
    color: #fff;
    padding: 15px;
}

.main {
    display: flex;
    flex: 1;
}

.content {
    width: 800px;
    padding: 20px;
    background: #fafafa;
}

.sidebar {
    width: 330px;
    padding: 20px;
    background: #e0e0e0;
}

.footer {
    background: #212121;
    color: #fff;
    padding: 20px;
}