body {
    font-family: Courier, monospace;
}
textarea {
    width: 49%;
    height: 600px;
    resize: none;
}

div#target {
    width: 49%;
    height: 595px;
    border: 1px solid black;
    padding: 5px;
    display: inline-block;
    vertical-align: top;
    white-space: pre-wrap;
    overflow-x: scroll;
    font-size: 14px;
}

.tag {
    color: green;
}

.attribute {
    color: blue;
}

.value {
    color: red;
}

.text {
    color: black;
}

.highlight {
    background-color: #ccc;
}