body {
    display: flex;
    height: 100vh;
    margin: 0;
    overflow: hidden;
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif
}

#main-container {
    display: flex;
    flex-direction: column;
    flex-grow: 1; 
}

aside {
    border: 1px solid #000000;
    width: 250px;
    height: 100vh; 

    background-color: #919191;
    color: #FFFFFF;

    font-weight: bold;

    box-shadow: 5px 0px 20px #000000;
    z-index: 10;
}

ul {
    list-style: none;
}

.dir {
    position: relative;
}

.dir::before {
    display: inline-block;
    content: "^";
    transform: rotate(var(--before-rotation, 90deg));
    position: absolute;
    left: -15px;
    top: -1px;
}

.dir_open {
    display: block;
}

.dir:hover {
    cursor: pointer;
    font-size: 1.1em;
}

li {
    margin: 10px 0px;
}

li ~ ul {
    margin-left: -30px;
    display: none;
}

.getFile {
    cursor: pointer;
}

.getFile:hover {
    text-decoration: underline;
}

header {
    background-color: #919191;
    border: 1px solid #000000;
    padding: 10px;
    box-shadow: 0px 5px 20px #000000;
    z-index: 10;
}

main {
    flex-grow: 1; 
    overflow-y: none;
    padding: 0px 0px 0px 20px;
    background-color: #a9a9a9;
}

iframe {
     background-color: #ffffff;
     box-shadow: 0px 0px 20px #000000;
    display: block;
    margin: auto;
    width: 70%;
    height: 100%;
}