JSFiddle - React, Tailwind, and code Playground

by Sam88

HTML

<div class="container">
    <div>text</div>
    <div>text</div>
    <div>text</div>
    <div>text</div>
    <div>text</div>
    
</div>

CSS

.container{
    margin-left:20px;
}

.container :first-child::before{
    content:"";
    position:absolute;
    left:-15px;
    width: 0; 
	height: 0; 
	border-top: 10px solid transparent;
	border-bottom: 10px solid transparent;
	
	border-left: 10px solid red;
    -webkit-animation:flashing 1s ease  infinite;
    animation:flashing 1s ease  infinite;
}

.container :first-child{ 
    position:relative;
    
}

@-webkit-keyframes flashing
{
0%   {border-color:white;}

50% {border-color:white;}
}

/* Standard syntax */
@keyframes flashing
{
0%   {border-color:white;}

50% {border-color:white;}
}