body{

    margin: 0;

    box-sizing: border-box;

    height: 5000px; /*pode ser retirado*/

}



nav{

    background-color: #333;

    overflow: hidden;

    position: fixed;

    width: 100%;

}



nav .logo{

    color: #fff;

    float: left;

    display: block;

    padding: 14px 16px;

}



nav a{

    color: #fff;

    float: right;

    text-decoration: none;

    display: block;

    padding: 14px 16px;

}



nav a:hover{

    transition: 0.5s;

    background-color: #e4e4e4;

    color: #333;

}