* { box-sizing: border-box;}
body {
    font-family: Arial, Helvetica, sans-serif;
}
#wrapper {
    width: 80%;
    margin-left: auto;
    margin-right: auto;
    border: thin solid black;
}
header {
    margin: 10px;
    padding: 10px;
    background-color: gray;
    color:white;
}
header > img {
    width: 20%;
    height:auto;
    float: right;
}
.clearright {
    clear: right;
}
nav {
    display: flex;
    justify-content: center;
    text-align: center;
    flex: 1;
}
nav > div {
    background-color: #f1f1f1;
    margin: 10px;
    padding: 10px 20px;
    font-size:20px;
}
nav > div > a{
    color: steelblue;
    font-weight: bold;
    text-decoration: none;
}
nav > div > a:hover {
    color: royalblue;
    text-decoration: underline;
}
main {
    display: flex;
}
main > div {
    background-color: #f1f1f1;
    margin: 10px;
    padding:10px;
}
.left {
    flex: 1;
}
.right {
    flex: 2;
    border: 1px solid #dddddd;
    background-color: white;
}
.rightfig {
    flex: 2;
    border: 1px solid #dddddd;
    background-color: white;
    text-align: center;
}
footer {
    background-color:gainsboro;
    margin: 10px;
    padding: 10px;
}
footer p {
    text-align: center;
}
@media only screen and (max-width:900px) {
    #wrapper {
        width: 100%;
        border: none ;
    }
    header > img {
        width: 25%;
        height: auto;
        float: right;
    }
}
@media only screen and (max-width: 510px) {

}