#toolbar {
    display: flex;
    align-items: center;
    background-color: #555;
    color: #fff;
    padding: 0.5em;
}
#toolbar button,
#page-mode input {
    color: currentColor;
    background-color: transparent;
    font: inherit;
    border: 1px solid currentColor;
    border-radius: 3px;
    padding: 0.25em 0.5em;
}
#toolbar button:hover,
#toolbar button:focus,
#page-mode input:hover,
#page-mode input:focus {
    color: lightGreen;
    outline: none;
}

.container{
    width: 500px;
    height: 500px;
    position: relative;
    /*margin: 20px;*/
    overflow: scroll;
}
.box{
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0.8;  /* for demo purpose  */
}

#page-mode {
    display: flex;
    align-items: center;
    padding: 0.25em 0.5em;
}

.textLayer {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
    opacity: 0.2;
    line-height: 1;
}

.textLayer > span {
    color: transparent;
    position: absolute;
    white-space: pre;
    cursor: text;
    transform-origin: 0% 0%;
}

.textLayer .highlight {
    margin: -1px;
    padding: 1px;
    background-color: rgba(180, 0, 170, 1);
    border-radius: 4px;
}

.textLayer .highlight.begin {
    border-radius: 4px 0 0 4px;
}

.textLayer .highlight.end {
    border-radius: 0 4px 4px 0;
}

.textLayer .highlight.middle {
    border-radius: 0;
}

.textLayer .highlight.selected {
    background-color: rgba(0, 100, 0, 1);
}

.textLayer ::-moz-selection {
    background: rgba(0, 0, 255, 1);
}

.textLayer ::selection {
    background: rgba(0, 0, 255, 1);
}

.textLayer .endOfContent {
    display: block;
    position: absolute;
    left: 0;
    top: 100%;
    right: 0;
    bottom: 0;
    z-index: -1;
    cursor: default;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.textLayer .endOfContent.active {
    top: 0;
}