.list-group {
    max-height: 300px;
    margin-bottom: 10px;
    overflow-y: scroll;
    -webkit-overflow-scrolling: touch;
}


*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 30px;
    background-color: #f0f0f0;
}

.textarea-container,
.backdrop,
textarea.marked-textarea {
    width: 100%;
    height: 130px;
}

.highlights,
textarea.marked-textarea {
    padding: 10px;
    font-size: 14px;
    letter-spacing: 1px;
    transition: border-color .15s ease-in-out, box-shadow .15s ease-in-out;
}

.textarea-container {
    display: block;
    margin: 0 auto;
    transform: translateZ(0);
    -webkit-text-size-adjust: none;
}

.backdrop {
    position: absolute;
    z-index: 1;
    border: 1px solid lightgray;
    background-color: #fff;
    overflow: auto;
    pointer-events: none;
    transition: transform 1s;
}

.highlights {
    white-space: pre-wrap;
    word-wrap: break-word;
    color: transparent;
}

textarea.marked-textarea {
    display: block;
    position: absolute;
    z-index: 2;
    margin: 0;
    border: 1px solid lightgray;
    border-radius: 0;
    color: #444;
    background-color: transparent;
    overflow: auto;
    resize: none;
    transition: transform 1s;
}

marker {
    border-radius: 3px;
    color: transparent;
    background-color: rgba(245, 30, 30, 0.637);
}

.marked-textarea:focus {
    border-color: #86b7fe;
    outline: 0;
    box-shadow: 0 0 0 .25rem rgba(13, 110, 253, .25)
}