body {margin: 0px;}

div.content {
    margin-left: 175px;
    padding: 1px 16px;
    height: 1000px;
}

@media screen and (max-width: 900px) {
    ul.sidenav {
        width: 100%;
        height: auto;
        position: relative;
    }
    ul.sidenav li a {
        float: left;
        padding: 15px;
    }
    div.content {margin-left: 0;}
}

@media screen and (max-width: 400px) {
    ul.sidenav li a {
        text-align: center;
        float: none;
    }
}

a:link {
  color: blue;
  background-color: transparent;
  /*text-decoration: none;*/
}

a:visited {
  color: blue;
  background-color: transparent;
  /*text-decoration: none;*/
}