Flat.css

body {
    background-color: tan;
    color: #555555;
        
    font-family: arial, helvetica, sans-serif;
    font-size: 12px;
    font-weight: normal;
    /* Same as above */
    font: normal 12px arial, helvetica, sans-serif;
    
    line-height: 1.6em;
    margin: 0;
}

.container {
    width: 80%; margin: auto;
}

.topnav {
    background-color: #0085AD;
    overflow: hidden;
    box-shadow: 2px 2px 5px;
}

/* Style the links inside the navigation bar */
.topnav a {
  float: left;
  color: #f2f2f2;
  text-align: center;
  padding: 20px 16px;
  text-decoration: none;
  font-size: 17px;
}

/* Change the color of links on hover */
.topnav a:hover {
  background-color: #ddd;
  color: #16C4FA;
}

/* Add a color to the active/current link */
.topnav a.active {
  background-color: #0085AD;
  color: #ddd;
}

.style {
    margin-top: 2em;
    margin-bottom: 2em;
}

.mainpic {
    width: 100%;
    height: auto;
}
    
.box-2 {
    margin-top: 3em;
    margin-bottom: 3em;
}

.box-2 h2{
    margin-top: 1em;
    margin-bottom: 1em;
}