body {
    margin: auto;
    background: #efefef;
    font-family: arial;
}

.nav_bar {
    margin: auto;
    border-bottom: 1px solid #000000;
    width: 860px;
    padding: 0px 20px 0px 20px;
    height: 64px;
    margin-top: 30px;
}
.nav_bar ul {
    padding: 0;
    list-style: none;
    
}
.nav_bar ul li {
    float: left;
    font-size: 16px;
    font-weight: bold;
    margin-right: 10px;

}
.nav_bar ul li a {
    text-decoration: none;
    color: #000000;
    background: #6db1e4;
    border: 1px solid #000000;
    border-bottom: none;
    padding: 23px 20px 22px 20px;
    -webkit-border-top-right-radius: 10px;
    -webkit-border-top-left-radius: 10px;
    -moz-border-radius-topleft: 10px;
    -moz-border-radius-topright: 10px;
    width: 75px;
    display: block;
    text-align: center;
}
.nav_bar ul li a:hover {
    text-decoration: none;
    color: #000000;
    background: #96e0e9;
    -moz-transition: background-color 200ms ease-in;
    -webkit-transition: background-color 200ms ease-in;
    -ms-transition: background-color 200ms ease-in;
    -o-transition: background-color 200ms ease-in;
    transition: background-color 200ms ease-in;
}
.nav_bar ul li a#onlink {
    background: #ffffff;
    color: #000000;
    border-bottom: 1px solid #ffffff;

}
.nav_bar ul li a#onlink:hover {
    background: #ffffff;
    color: #000000;

}
.main_container{
    margin: auto;
    width: 860px;
    padding: 20px;
    border: 1px solid #000000;
    min-height: 400px;
    border-top: none;
    background: #ffffff;
}

.main_container p {
    font-size: 14px;
    margin: 0;
    padding: 0;
}