* {
    font-family: 'Courier New', Courier, monospace;
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    background-position: center;
    background-repeat: no-repeat;
    background-size:auto;
    max-width: 100%;
}

html,body {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    background-image: url(img/jake-walker-MPKQiDpMyqU-unsplash.jpg);
    width: 100%;
    background-attachment: fixed;
}

img {
    border: 1px solid;
}

header {
    background-color: white;
    width: 90%;
    margin: auto;
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

main {
    width: 100%;
    max-width: 100vw;
    padding: 1rem;
    gap: 1rem;
    display: flex;
    justify-content: start;
    align-items: start;
    position: absolute;
}

.solutionN, .solutionB {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.levelN, .levelB {
    background-color: white;
    min-width: 10%;
    height: 35rem;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    justify-content: start;
    align-items: start;
    gap: 1rem;
    position: sticky;
    top: 2rem;
}

.level>div {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    overflow-y: auto;
}

.part {
    padding: 1rem;
    background-color: white;
    width: fit-content;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

@media screen and (max-width:40rem) {
    * {
        word-wrap: break-word;
    }

    h1 {
        text-align: center;
    }

    main {
        flex-direction: column;
        justify-content: center;
        align-items: center;
    }

    .levelN, .levelB {
        width: auto;
        align-self: center;
        position: static;
    }

    .part {
        max-width: 100%;
    }

}