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HTML 

              
                <div class="container-md">
	<div class="row comment-form">
		<div class="col-md">
			<h3>Комментарии</h3>
			<p>
				Вы вошли как <a href="#">Alexa Poruch</a>
			</p>
			<form method="POST" action="">
				<div class="form-group">
					<textarea id="editor" class="form-control"></textarea>
				</div>
				<div class="form-group text-right">
					<button class="btn btn-secondary comment-send" type="button">Отправить</button>
				</div>
			</form>
		</div>
	</div>
	<div class="row">

		<div class="col-md">

			<ul class="list-unstyled comment">
				<li>
					<div class="row">
						<div class="col-sm-2 text-center">
							<img class="avatar d-none d-md-block" src="https://www.gravatar.com/avatar/a2c4fd58ec293b5cb556fde9685ee31e?d=mp&s=200" alt="Alexa Poruch" />
						</div>
						<div class="col-md-10">
							<div class="card">
								<div class="card-header p-0 px-3">
									<div class="row py-3">
										<div class="mx-3 user">
											<a class="isAuthor" href="#">Alexa Poruch</a>
										</div>
										<div class="ml-auto mr-4">
											<i class="fas fa-reply" data-toggle="tooltip" title="Ответить"></i>
										</div>
									</div>
								</div><!-- card-header -->
								<div class="card-body">
									<p class="card-text">Lorem ipsum dolor sit amet, consectetur adipiscing elit.
										Videamus animi partes, quarum est conspectus illustrior; Ita credo. Quae contraria sunt his, malane?</p>
									<p>Ea possunt paria non esse. Non semper, inquam; <b>Duo Reges: constructio interrete.</b>
										<b>Omnis enim est natura diligens sui.</b> <i>Invidiosum nomen est, infame, suspectum.</i> Quid Zeno?</p>
									<div class="row">
										<div class="ml-auto pr-3">
											<i class="fas fa-thumbs-up mr-1" data-toggle="tooltip" title="Нравится"></i>
											<i class="fas fa-thumbs-up fa-rotate-180" data-toggle="tooltip" title="Не нравится"></i>
										</div>
									</div>
								</div><!-- card-body -->
							</div><!-- card -->
						</div><!-- col-9 -->
					</div><!-- row -->
				</li>

			</ul>

		</div>
	</div>
</div>
!

CSS 

              
                @body-bgcolor: darken(#1e1f26, 5%);
@card-bgcolor: lighten(@body-bgcolor, 20%); // #32383e;
@card-header-bgcolor: darken(@card-bgcolor, 8%);

@text-color: lighten(@body-bgcolor, 75%);

@card-borderRadius: 15px;

body {
	background-color: @body-bgcolor;
	color: @text-color;

	font-weight: 300;
}

div.row.comment-form {
	letter-spacing: 0.03em;

	& button.comment-send {
		margin-right: 30px;
	}

	& textarea#editor {
		width: 98%;
		height: 100px;
	}

	& a {
		color: lighten(@text-color, 15%);
		font-weight: 700;
	}
}
ul.comment {
	ul {
		margin-left: 5rem;
	}

	li {
		margin: 1.5rem 10px;
	}

	& img.avatar {
		width: 100%;
		max-width: 200px;
		min-width: 100px;
		padding: 7px;
		margin-top: 5px;
		margin-right: 15px;
		border: @card-bgcolor solid 2px;

		border-radius: 15px;
	}

	& .card {
		border-radius: @card-borderRadius;
		background-color: @card-bgcolor;

		& .fas {
			cursor: pointer;
		}

		& .card-header {
			border-radius: @card-borderRadius @card-borderRadius 0 0;
			background-color: @card-header-bgcolor;
			z-index: 2;
			& a {
				color: @text-color;
				font-weight: bolder;

				padding: 8px 5px;

				&.isAuthor {
					font-weight: bold;
					color: lighten(@text-color, 5%);
					text-decoration: none;

					&:hover {
						outline: fadeout(white, 99%) solid 5px;
					}

					&:after {
						position: relative;
						top: -3px;

						text-decoration: none !important;

						content: "Автор";

						font-size: 62%;
						font-weight: bold;
						color: lighten(@text-color, 15%);

						padding: 2.3px 5px;
						margin-left: 10px;
						border-radius: 5px;
						background-color: lighten(@card-header-bgcolor, 25%);
					}
				}
			} // & a

			&::before {
				content: "";

				position: absolute;
				left: -20px;
				top: 20px;

				width: 0;
				height: 0;
				border-style: solid;
				border-width: 17.5px 40px 17.5px 0;
				border-color: transparent @card-header-bgcolor transparent transparent;

				z-index: 1;
			}
		} // & .card-header

		& .card-body {
			font-size: 90%;
			letter-spacing: 0.03em;

			border-radius: 0 0 @card-borderRadius @card-borderRadius;
			background-color: @card-bgcolor;
		}
	}
}
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JS
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