html, body {
    height: 100%;
    overflow: hidden;
}

#main {
    position: relative;
    height: 100vh;
}

#learn-menu {
    position: absolute;
    top: 0%;
    right: 0%;
    z-index: 10;
    width: 300px;
    box-sizing: border-box;
    padding: 0 40px;
    height: 100vh;
    background-color: rgb(9, 12, 44);
    color: rgb(236, 229, 229);
}

#click {
    position: absolute;
    top: 50%;
    left: calc(50% - 150px);
    transform: translate(-50%, -50%);
}

#buy-commands-linux, #buy-shell-operators {
    display: flex;
    flex-direction: column;
}

.item {
    margin: 5px;
}

#explanation-div {
    position: absolute;
    z-index: 9;
    bottom: 5%;
    left: calc(50% - 150px);
    transform: translate(-50%, -50%);
    background-color: rgb(106, 255, 47);
    padding: 10px;
    width: 500px;
    box-sizing: border-box;
    border: 2px solid green;
    border-radius: 5px;
    text-align: center;
}