html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: arial, verdana, sans-serif;
}

body {
    display: flex;
    flex-direction: column;
}

.bar {
    background-color: #333333;
    color: #fff;
    padding: 10px;
    text-align: center;
}

.container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

textarea {
    flex: 1;
    width: 100%;
    font-size: 16px;
    padding: 16px;
    border: 0;
    box-sizing: border-box;
    background-color: white;
}

.up-download {
    display: flex;
}

.action-button {
    padding: 10px;
    background-color: #333333;
    color: #fff;
    cursor: pointer;
}

.inputfile {
    opacity: 0%;
}