html, body {
    margin: 0;
    text-align: center;
    background-color: #233;
    color: #edc;
    height: 100%;
    font-size: 18px;
    font-family: sans-serif;
    align-content: center;
}

textarea {
    font-family: sans-serif;
    background-color: #edc;
    width: 65%;
    padding: 18px;
}

.interface {
    display: flex;
    height: 100%;
    flex-direction: column;
}

.two {
    align-content: center;
    flex: 2;
}

.one {
    align-content: center;
    flex: 1;
}

.bigimg {
    position: absolute;
    left: 1;
    top: 1;
    z-index: -1;
}