body {
    font-family: Open Sans, Arial, sans-serif;
    color: #454545;
    font-size: 16px;
    margin: 2em auto;
    max-width: 800px;
    padding: 1em;
    line-height: 1.4;
    text-align: justify;
    background-color: #fefefe;
}

.directory, .file {
    margin: 0;
    border: 1px solid #454545;
    margin-top: -1px;
    padding: 0.5em;
    -webkit-transition: background-color 0.5s linear;
    -moz-transition: background-color 0.5s linear;
    -ms-transition: background-color 0.5s linear;
    -o-transition: background-color 0.5s linear;
    transition: background-color 0.5s linear;
}

.directory:hover, .file:hover {
    background-color: lightgray;
    -webkit-transition: background-color 0.5s linear;
    -moz-transition: background-color 0.5s linear;
    -ms-transition: background-color 0.5s linear;
    -o-transition: background-color 0.5s linear;
    transition: background-color 0.5s linear;
}