html
{
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
}

body
{
    background-color: rgb(221, 221, 221);
    margin: 0;
    font-size: 90%;
}

header
{
    padding: 0;
    background-color: #5B5F5C;
    clear: left;
    text-align: center;
    height: 4rem;
    overflow: auto;
    position: fixed;
    width: 100%;
}

footer 
{
	bottom: 0;
    right: 0;
    left: 0;
	padding: 0 1rem 0 0;
    margin-top: 0;
	background-color: #5B5F5C;
	height: 1rem;
    font-size: 0.7rem;
    font-style: italic;
    text-decoration: none;
    text-align: right;
    color: #848789;
    position: fixed;
}

nav 
{
    float: left;
    width: 15%;
    margin: 0;
    padding: 0;
    margin-right: 0%;
    margin-top: 4rem;
    background-color: #5b5f5c;
    position: fixed;
    overflow: auto;
}

article
{
    margin-left: 15%;
    margin-top: -7rem;
    padding: 1rem;
    overflow: auto;
    height: 100%;
}

.spacer
{
    width: 100%;
    height: 11rem;
}

/*-----------------------------------------------------------------------------------------------*/

/*  links  */

a:link  /*unvisited*/
{
    text-decoration: none;
    font-family: sans-serif, monospace, Verdana;
    font-size: 1rem;
    font-style: normal;
}

a:hover     /*mouse over link*/
{
    text-decoration: underline;
    font-family: sans-serif, monospace, Verdana;
    font-size: 1.25rem;
    font-style: normal;
}

li a:link  /*unvisited*/
{
    color: white;
    text-decoration: none;
    font-family: sans-serif, monospace, Verdana;
    font-size: 1rem;
    padding: 4px;
}

li a:hover:not(.active)     /*mouse over link*/
{
    color: black;
    text-decoration: underline;
    font-family: sans-serif, monospace, Verdana;
    font-size: 1.25rem;
    background-color: white;
}

li a.active    /*selected link*/
{
    color: azure;
    text-decoration: none;
    font-family: sans-serif, monospace, Verdana;
    font-size: 1rem;
    background-color: #bbd88f;
}

/*-----------------------------------------------------------------------------------------------*/

/*  text  */

.heading
{
    font-family: Ubuntu, monospace, sans-serif;
    font-size: 2.5rem;
    font-weight: bold;
    text-transform: lowercase;
    margin: auto;
    padding: 0rem;
}


h2 
{
    font-family: Ubuntu, monospace, sans-serif;
    font-size: 2rem;
    font-style: normal;
    font-weight: bold;
    margin: auto;
    text-transform: uppercase;
}



h3 
{
    font-family: Ubuntu, monospace, sans-serif;
    font-size: 1.5rem;
    font-style: normal;
    font-weight: bold;
    margin: auto;
}


h4 
{
    font-family: Ubuntu, monospace, sans-serif;
    font-size: 1.25rem;
    font-style: normal;
    font-weight: bold;
    margin: auto;
    text-decoration: underline red;
}


h5 
{
    font-family: Ubuntu, monospace, sans-serif;
    font-size: 1.125rem;
    font-style: normal;
    font-weight: bold;
    margin: auto;
    text-decoration: underline red;
}

.read
{
    font-family: Verdana, monospace, sans-serif;
    font-size: 1rem;
    font-style: normal;
    font-weight: normal;
}

.command
{
    background-color: #898989; 
    text-align: left;
    padding: 0.5rem
}

.code
{
    background-color: whitesmoke; 
    text-align: left;
    padding: 0.5rem;
    border-color: ##898989;
    border-width: medium medium medium 20px;
    border-style: solid;
}


/*-----------------------------------------------------------------------------------------------*/

/* for index page*/

.clearfix::after 
{
    content: "";
    clear: both;
    display: table;
}

/*-----------------------------------------------------------------------------------------------*/

/* for about page*/

.img-circle 
{
    border-radius: 50%;
    max-width: 200px;
    max-height: 200px;
}

.img-center

{
    display: block;
	margin: 0 auto;
}

.img-normal 
{
    max-width: 800px;
    width: 100%;
    max-height: auto;
}