Formula:Versus aggregati/styles.css

.grex {
	display: flex;
	position: relative;
	justify-content: center;
	flex-direction: column;
	box-sizing: border-box;
	width: auto;
	height: auto;
	min-width: 20px;
	min-height: 30px;
	padding: 0 0 0 23px;
	text-align: left;
	vertical-align: middle;
	margin: 32px 15px 32px 0;
	border: none;
	background-color: transparent;
	background-image:
		radial-gradient(circle at 0 0, rgba(0,0,0,0) 6px, #000 6px, #000 8px, rgba(0,0,0,0) 8px),
		radial-gradient(circle at 0 14.5px, rgba(0,0,0,0) 6px, #000 6px, #000 8px, rgba(0,0,0,0) 8px);
	background-size: 8px 14px;
	background-position: left center;
	background-repeat: no-repeat;
	overflow: visible;
}

.grex::before {
	content: "";
	display: block;
	position: absolute;
	left: 20px;
	top: -6px;
	box-sizing: border-box;
	width: 100%;
	height: 50%;
	margin-left: -14px;
	border-left: 2px solid #000;
	border-top-left-radius: 10px calc(10% + 10px);
}

.grex::after {
	content: "";
	display: block;
	position: absolute;
	left: 20px;
	bottom: -6px;
	box-sizing: border-box;
	width: 100%;
	height: 50%;
	margin-left: -14px;
	border-left: 2px solid #000;
	border-bottom-left-radius: 10px calc(10% + 10px);
}

.grex ol,
.grex ul {
	padding-left: 0;
	margin-left: 1em;
}

.grex > ol > li,
.grex > ul > li {
	margin-top: 1em;
}

.grex > :first-child,
.grex > ol > li:first-of-type,
.grex > ul > li:first-of-type {
	margin-top: 0;
}

.grex > :last-child {
	margin-bottom: 0;
}