* {
    font-family: sans-serif;
    margin: 0;
    padding: 0;
}

#qr-tree {
    background-color: antiquewhite;
    width: 100%;
    height: 100%;
    position: absolute;
}

h1 {
    position: relative;
    color: white;
    padding: 3px;
}

.input-container {
    position: relative;
    color: white;
    margin: 3px;
}

input[type="text"] {
    padding: 5px;
}

input[type="button"] {
    padding: 5px;
}