JSFiddle - React, Tailwind, and code Playground

HTML

<div class="content">
			<div class="code-container"><div class="code-numbers">1<br>2<br>3<br>4<br>5<br>6<br>7<br>8<br>9<br>10<br></div><div class="code-line">:local iname "ether2";		# WAN Interface
/ip firewall mangle
add action=mark-connection chain=prerouting comment=CommentABCDEF in-interface=$iname new-connection-mark=CommentABCDEF protocol=tcp
add action=mark-connection chain=postrouting comment=D-FUP-Upload new-connection-mark=D-FUP-Upload out-interface=$iname protocol=tcp
add action=mark-packet chain=prerouting comment=CommentERRWWRHEWRHR connection-mark=CommentABCDEF in-interface=$iname new-packet-mark=CommentERRWWRHEWRHR passthrough=no protocol=tcp
add action=mark-packet chain=prerouting comment=Comment2462436246234 connection-mark=CommentABCDEF in-interface=$iname new-packet-mark=Comment2462436246234 passthrough=no protocol=tcp
add action=mark-packet chain=prerouting comment=Comment35437345434263426 connection-mark=CommentABCDEF in-interface=$iname new-packet-mark=Comment35437345434263426 passthrough=no protocol=tcp

/system scheduler
add interval=2s name=D-FUP-Processor on-event=D-FUP-Processor policy=ftp,reboot,read,write,policy,test,password,sniff,sensitive start-time=startup
			</div></div>
		</div>

CSS

body {
				height: 100%;
				width: 100%;
  				margin: 0 auto;
				padding: 0px 0px 0px 0px;
			}
			.content {
				text-align:center;
				margin: 0 auto;  
        padding-top: 40px;
				letter-spacing: 1px;
			}
			code {
				font-family: "Sans Mono", "Consolas", "Courier", monospace;
				font-size: 12px;
			}
			.code-container {
				width: 90%;
        margin: 0 auto;
				position: relative;	
				box-shadow: 0px 0px 2px rgba(0, 0, 0, 1), 0px 2px 25px rgba(0, 0, 0, 0.6);
			}
			.code-numbers {
				font-family: "Sans Mono", "Consolas", "Courier", monospace;
				font-size: 12px;
				float: left;
				color: rgb(128, 128, 128);
				border-right: 1px solid rgb(128, 128, 128);
				width: 15px;
				padding: 0px;
				padding-left: 20px;
				padding-right: 5px;
				user-select: none;
				text-align: right;
			}
			.code-line {
				font-family: "Sans Mono", "Consolas", "Courier", monospace;
				font-size: 12px;
				float: right
				padding: 0px;
				padding-left: 7px;
				padding-right: 30px;
				white-space: pre;
				text-align: left;
				overflow: auto;
            }