.footer{
    display: block;
    float: left;
    overflow: auto;
    background-color: #ECEEFF;
    width: 100%;
    text-align: center;
    margin-top: 20px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6em;
}


nav a:hover {
    background-color: white;
}