style.css

.container{
    width: 100%;
}
h1{
    font-weight: bold;
    font-size: 1.8rem;
}
#navbar{
    width: 300px;
    min-width: 290px;
    display: flex;
    height: 100%;
    flex-direction: column;
    border-right: solid;
    position: fixed;
}


#main-doc{
    margin: 0px 20px 0 300px;
    text-align: justify;
    padding: 10px 20px;
    position: absolute;  
    
}
.nav-link{
    list-style-type: none;
    font-size: 1rem;
    cursor: pointer;
    text-decoration: none;
    color:black;
}
#navbar li{
    border-top: solid 1px;
    list-style-type: none;
    text-align: start;
    padding: 10px 30px;
}
code{
    background-color: #F7F7F7;
    width: 100%;
    height: 30px;
    display: block;
    text-align: left;
    padding: 15px;
    margin: 10px 10px;
}
.nav-list{
padding: 0;
}

@media (max-width: 480px) {
    #navbar {
        background-color: aliceblue;
        position: absolute;
        height: 100%;
        max-height: 300px;
        z-index: 1;
        border: 0;
        min-width: 100%;
        top: 0;
    }
    #main-doc {
        background-color: aliceblue;
        position: relative;
        margin: 300px 0 0 0;
    }
    .nav-list {
        max-height: 275px;
        overflow-y: auto;
        border-bottom: solid 1px;
        border: 1px solid;
    }
}