body 
{ 
   background: white; 
   color: black; 
   margin-left: 10%;  
   margin-right: 10%;
}

h1
{
    font-weight: bold;  
    font-size: 4.0em;
    font-family: sans-serif, arial;
    text-align: center;
}

h2
{
    font-weight: bold;  
    font-size: 3.0em;
    font-family: sans-serif, arial;
    text-align: center;
}

h3
{
    font-weight: bold;  
    font-size: 2.0em;
    font-family: sans-serif, arial;
    text-align: left;
}

h4
{
    font-weight: bold;  
    font-size: 1.5em;
    font-family: sans-serif, arial;
    text-align: left;
    font-style: italic
}

h5
{
    font-size: 1.3em;
    font-family: sans-serif, arial;
    text-align: left;
    font-style: italic
}

blockquote
{
    font-size: 95%;
}

ul
{
    list-style-type: disc;
}

.abstract 
{ 
    margin-left: 5%; 
    margin-right: 10%; 
    font-style: bold;
    text-align: justify;
    text-indent: 0;
}