body {
    font-family: Open Sans, Arial, sans-serif;
    color: #454545;
    font-size: 16px;
    background-color: #fefefe;
}

.fileupload {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0,0,0,0.5);
    z-index: 2;
    cursor: pointer;
    text-align: center;
    color: white;
    font-size: 70px;
}

.hidden {
    display: none;
}

h1, h2, h3 {
    padding: 0;
    margin: 0;
}

.content {
    margin: 2em auto;
    max-width: 800px;
    padding: 1em;
    line-height: 1.4;
    text-align: justify;
}

.directory, .file {
    margin: 0;
    padding: 0;
}
.directory a, .file a {
    color: #454545;
    text-decoration: none;
    display: block;
    width:100%;
    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 a , .file:hover a {
    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;
}

.index {
    display: flex;
    text-align: center;
    flex-direction: column;
    font-size: 32px;
}

.index a {
    color: #454545;
    text-decoration: none;
}

a.back-button {
    display: inline-block;
}