html {
    height: 100%;
}
body {
    height: 100%;
    background-image: url("/static/background.jpg");
    background-repeat: no-repeat;
    background-size: cover;
    background-attachment: fixed;
}
.wrapper {
    display: flex;
    height: 100%;
}
.sidebar {
    height: 100%;
    width: 300px;
    background-color: #231D53;
}