body{
    margin: 0px;
    padding: 0px;
    font-family: Arial, Helvetica, sans-serif;
    background-color: #f9f9f9;
}
header{
background-color: #3E4E50;
color: white;
text-align: center;
padding:10px;
}
a{
    padding: 10px;
    text-decoration: none;
    color: white;
}
#section{
    padding: 15px;
    margin: 20px;
    background-color: #fff;
    border-radius: 5px;
}
img{
    width: 400px;
    margin: 10px;
    border-radius: 5px
}
footer{
    text-align: center;
    background-color: #333;
    padding: 10px;
    color: white;
}