<!-- 1、使用 border -->
<div class="border">border 实现</div>

<!-- 2、使用伪元素 -->
<div class="pesudo">伪元素实现</div>

<!-- 3、外 box-shadow -->
<div class="boxShadow">外 box-shadow 实现</div>

<!-- 4、内 box-shadow -->
<div class="insertBoxShadow">内 box-shadow 实现</div>

<!-- 5、drop-shadow -->
<div class="filterDropShadow">drop-shadow 实现</div>

<!-- 6、渐变 -->
<div class="linearGradient">线性渐变实现</div>

<!-- 7、outline -->
<div class="outline">outline 实现</div>

<!-- 8、滚动条 -->
<div class="scroll"></div>

<!-- 9、texr-decoration -->
<div class="textDecoration">texr-decoration</div>

<!-- 10、first-letter -->
<div class="fitstLetter">1</div>

<!-- 11、list-style -->
<div class="listStyle"></div>

<!-- <div class="listStyle2">11223344</div> -->

@import url("https://fonts.googleapis.com/css2?family=Open+Sans:ital,wght@1,300&display=swap");
html,
body {
	width: 100%;
	height: 100%;
	display: flex;
	flex-wrap: wrap;
}
div {
	flex-shrink: 0;
	font-family: "Open Sans", sans-serif;
	position: relative;
	width: 200px;
	height: 60px;
	line-height: 60px;
	margin: 20px;
	background: #ddd;
	text-align: center;
}

.border {
	border-left: 5px solid deeppink;
}

.pesudo::after {
	content: "";
	width: 5px;
	height: 60px;
	position: absolute;
	top: 0;
	left: 0;
	background: deeppink;
}

.boxShadow {
	margin-left: 25px;
	box-shadow: -5px 0px 0 0 deeppink;
}

.insertBoxShadow {
	box-shadow: inset 5px 0px 0 0 deeppink;
}

.filterDropShadow {
	margin-left: 25px;
	-webkit-filter: drop-shadow(-5px 0 0 deeppink);
}

.linearGradient {
	background-image: linear-gradient(
		90deg,
		deeppink 0px,
		deeppink 5px,
		transparent 5px
	);
}

.outline {
	margin-left: 25px;
	height: 50px;
	outline: 5px solid deeppink;
}
.outline:after {
	position: absolute;
	content: "outline实现";
	top: -5px;
	bottom: -5px;
	right: -5px;
	left: 0;
	background: #ddd;
}
.scroll {
	position: relative;
	width: 205px;
	background: deeppink;
	overflow-y: scroll;
}
.scroll::-webkit-scrollbar {
	width: 200px;
	background-color: #ddd;
}

// 下划线实现
.textDecoration {
	overflow: hidden;

	&::before {
		position: absolute;
		content: "_______";
		font-size: 40px;
		bottom: 30px;
		left: -15px;
		text-decoration: underline;
		color: deeppink;
		line-height: 60px;
		transform: rotate(90deg);
		right: 142px;
	}
}

.fitstLetter {
	position: relative;
	overflow: hidden;

	&::first-letter {
		background: deeppink;
		color: transparent;
		width: 5px;
		position: absolute;
		left: 0;
		top: 0;
		padding: 34px 0px;
		margin-left: -196px;
	}

	&::before {
		content: "::first-letter 实现";
		position: absolute;
		top: 0;
		left: 0;
		right: 0;
	}
}

.listStyle {
	position: relative;
	display: list-item;
	list-style: square inside;
	padding-left: 5px;
	line-height: 0;
	font-size: 600px;
	overflow: hidden;
	background: deeppink;
	color: #ddd;

	&::before {
		content: "list-style 实现";
		position: absolute;
		top: 0;
		bottom: 0;
		left: 0;
		right: 0;
		color: #000;
		font-size: 16px;
		line-height: 60px;
		z-index: 1;
	}
}

.listStyle2 {
	position: relative;
	display: list-item;
	list-style-type: square;
	list-style-position: inside;
	padding-left: 5px;
	line-height: 60px;
	font-size: 20px;
	overflow: hidden;
	background: deeppink;
	color: #ddd;
	animation: scale 5s infinite linear;
}

@keyframes scale {
	0%,
	30% {
		font-size: 20px;
	}
	80%,
	100% {
		font-size: 600px;
	}
}