body
{
font-family: Times New Roman;
padding: 20px;
background: #F5B7B1
}

.topnav
{
overflow: hidden;
background-color: #333;
}

.topnav a
{
float: left;
color: #f2f2f2;
text-align: center;
padding: 14px 16px;
text-decoration: none;
font-size: 17px;
}

.topnav a:hover
{
background-color: #ddd;
color: black;
}

.topnav a.active
{
background-color: #FA8072;
color: white;
}

.header
{
padding: 20px;
font-size: 40px;
text-align: center;
background: white;
}

.leftcolumn
{
float: left;
width: 20%
}

.rightcolumn
{
float: right;
width: 80%
}

.card
{
background-color: white;
padding: 20px;
margin-top: 20px;
}

.thkuimg
{
border: 5px solid black;
}

p.hidden
{
border: hidden;
}