JSFiddle - React, Tailwind, and code Playground

by Nik Shevchenko

HTML

<div class="main">Ex. #1</div>

<div class="triangle-example-1">Test CSS: AFTER TRIANGLE</div>

<div class="main">Ex. #2</div>

<div class="triangle-example-2-main">Test CSS: DIV TRIANGLE</div>
<div class="triangle-example-2-triangle"></div>

<div class="main">Ex. #3</div>

<div class="triangle-example-3-main">Test CSS: DIV TRIANGLE</div>
<div class="triangle-example-3-triangle"></div>

<div class="main">Ex. #4</div>
<div class="arrow_box">Test CSS: DIV TRIANGLE</div>

CSS

.main {
  text-align: center;
  font-size: 40px;
  font-weight: 700;
  margin-top: 50px;
  margin-bottom: 10px;
}

.triangle-example-1 {
    height: 50px;
    background-color: #e8e8e8;
    text-align: center;
    padding-top: 10px;
    position: relative;
}
.triangle-example-1::after{
    content: '';
    position: absolute;
    left: 48%;
    top: 100%;
    width: 0;
    height: 0;
    border-left: 20px solid transparent;
    border-right: 20px solid transparent;
    border-top: 20px solid #e8e8e8;
    clear: both;
}

.triangle-example-2-main {
  width: 100%;
  height: 100px;
  text-align: center;
  padding-top: 20px;
  background: #f9f9f9;
  margin: 0;
}
.triangle-example-2-triangle {
  width: 0;
  height: 0;
  margin-left: 48%;
  border-style: solid;
  border-width: 30px 25px 0 25px;
  border-color: #f9f9f9 transparent transparent transparent;
}

.triangle-example-3-main {
  width: 100%;
  height: 100px;
  background: #f9f9f9;
  margin: 0;
  text-align: center;
  padding-top: 20px;
}

.triangle-example-3-triangle {
    width: 40px;
    height: 0;
    padding-left: 51%;
    padding-top: 5%;
    overflow: hidden;
}
.triangle-example-3-triangle:after {
    content: "";
    display: block;
    width: 0;
    height: 0;
    margin-left:-30px;
    margin-top:-50px;
    
    border-left: 30px solid transparent;
    border-right: 30px solid transparent;
    border-top: 30px solid #f9f9f9;
}

.arrow_box {
	position: relative;
	background: #f0f0f0;
  text-align: center;
  padding-top: 10px;
  height: 100px;
}
.arrow_box:after, .arrow_box:before {
	top: 100%;
	left: 50%;
	border: solid transparent;
	content: " ";
	height: 0;
	width: 0;
	position: absolute;
	pointer-events: none;
}

.arrow_box:after {
	border-color: rgba(136, 183, 213, 0);
	border-top-color: #f0f0f0;
	border-width: 30px;
	margin-left: -30px;
}
.arrow_box:before {
	border-color: rgba(194, 225, 245, 0);
	border-top-color: #f0f0f0;
	border-width: 36px;
	margin-left: -36px;
}