styles.css

*{
    margin: 0;
    padding: 0;
}
body{
    font-family: 'Open Sans', sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color:rgb(3, 10, 117);
    background-color:#fff;
}
#navbar{
    position: fixed;
    min-width: 290px;
    top: 0;
    left: 0;
    width: 300px;
    height: 100%;
    background-color: #ededed;  
}
header{
    margin: 10px;
    text-align: center;
    font-size: 1.8rem;
    font-weight: 800;
}
#main-doc header{
    text-align: left;
    margin: 15px 10px;
    font-size: 2rem;
}
#navbar ul{
    height: 88%;
    overflow-y:auto ;
    overflow-x: hidden ;
}
#navbar li{
    list-style: none;
    width: 100%;
    color:rgb(3, 10, 117);
    margin-left: 10px;
}
#navbar a{
    text-decoration: none;
    color:rgb(3, 10, 117);
    padding: 10px 20px;
    display: block;
    cursor: pointer;
    font-weight:400;
}
#navbar a:hover{
    font-weight:600;
}

#main-doc{
    position: absolute;
    margin-left: 310px;
    padding: 20px;
}
section article{
    color:black;
    margin: 10px;
}
section li{
    margin:15px 0 0 30px;
}
h2{
    color:rgb(3, 10, 117) ;
    margin:10px 0;
}
p{
    margin:15px 0px;
}

code{
    display: block;
    text-align: left;
    white-space: pre-line;
    border-radius:10px;
    background-color:rgba(175, 179, 223, 0.863);
    padding: 10px;
    margin: 15px 0;
    word-break: normal;
    word-wrap: normal;
    position: relative;
}
table{
    width: 100%;
    background-color: rgba(221, 223, 247, 0.863);
    border-spacing:8px;
}
th , td{
    background-color: rgba(160, 162, 201, 0.5);
    border-collapse: collapse;
    padding:15px;
}
td{
    padding-left: 10px;
}
b{
    background-color:rgba(227, 227, 240, 0.5) ;
    font-weight: 400;
}

@media only screen and (max-width:815px){

    #navbar ul{
        height: 190px;
        border-top: 2px solid rgba(3, 10, 117,0.5) ;
    }
    #navbar{
        position:absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 275px; 
        z-index: 10;
    }
    #main-doc{
        position: relative;
        margin-top: 270px;
        margin-left:10px;
        padding: 20px;
    }
    #main-doc header{
        padding-top: 10px;
    }   
}
@media only screen and (max-width:400px){
    #main-doc{
        
        margin-left:-10px;
        padding-left:20px;
    }
    code{
        width: 100%;
        margin-left: -10px;
        padding:15px;
        min-width: 235px;
    }
    table{
        font-size: 0.7em;
        border-spacing: 5px;
    }
    th, td{
        padding:5px;
    }
}