styles.css

body {
    font-family: Arial;
    padding-top: 40px;
}

.add-comment-form {
    width: 25vw;
    font-family: Arial,sans-serif;
}

.label-input {
    display: block;
    margin-bottom: 15px;
}

.input,
.textarea {
    display: inline-block;
    box-sizing: border-box;
    width: 100%;
    height: 30px;
    padding: 0 11px;
    margin: 0;
    border-radius: 0;
    border: 1px solid #cbd1d4;
    font-size: 14px;
    color: #333;
    -webkit-appearance: none;
    -moz-appearance: none;
    -webkit-tap-highlight-color: transparent;
    background-color: #fff;
}

.textarea {
    height: 70px;
}

.button {
    display: inline-block;
    width: 100%;
    box-sizing: border-box;
    margin: 0;
    border-radius: 0;
    text-decoration: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    white-space: nowrap;
    -webkit-appearance: none;
    cursor: pointer;
    height: 30px;
    position: relative;
    padding: 0 15px;
    border: 1px solid;
    font-size: 14px;
    font-family: inherit;
    line-height: 28px;
    -webkit-transition: background-color .2s ease-in-out,color .2s ease-in-out,box-shadow .2s ease-in-out;
    transition: background-color .2s ease-in-out,color .2s ease-in-out,box-shadow .2s ease-in-out;
    color: #333;
    border-color: #cbd1d4;
    background-color: transparent;
}

.comments-wrapper {
    display: flex;
    justify-content: space-around;
    margin-bottom: 25px;
}

.comments {
    margin-bottom: 40px;
    width: 400px;
    background: #ccc;
    color: #333;
}

.comment-item {
    display: flex;
    width: 100%;
    padding: 10px;
    border-bottom: 1px solid #eee;
    justify-content: space-between;
    box-sizing: border-box;
}

    .comment-item:last-child {
        border-bottom: 0;
    }

    .comment-item__edit {
        display: inline-flex;
        padding: 0 10px;
        align-items: center;
        color: #4183c4;
        cursor: pointer;
    }

.comments-additional {
    width: 400px;
    background: #723;
    color: #fff;
}

    .comments-additional .comment-item__title {
        font-size: 24px;
    }

    .comments-additional .comment-item__text{
        font-style: italic;
    }

.comment-item__title {
    font-weight: bold;
    margin-bottom: 5px;
}