JSFiddle - React, Tailwind, and code Playground

HTML

<div class="golden"></div>
<div class="dotted"></div>
<div class="blue top arrow"></div>
<div class="blue bottom arrow"></div>
<div class="red top arrow"></div>
<div class="red bottom arrow"></div>
<div class="green top arrow"></div>
<div class="green bottom arrow"></div>

CSS

html {
    background-color: #000;
    width: 100%;
    height: 100%;
}   

body {
    background-color: #fff;
    width: 38.2%;
    height: 100%;
    margin: 0 30.9%;
    position: relative;
}

.golden {
    position: absolute;
    top: 23.6%;
    bottom: 38.2%;
    width: 38.2%;
    background-color: #ddd;
    left: 50%;
    margin-left: -19.1%;
}

.dotted {
    position: absolute;
    top: 38.2%;
    height: 0;
    width: 100%;
    border-top: 1px dotted #444;
}

.blue {
    position: absolute;
    right: 14.6%;
    width: 2px;
    background-color: #00f;
}

.blue.top {
    height: 38.2%;
    top: 0;
}

.blue.bottom {
    height: 61.8%;
    bottom: 0;
}

.red {
    position: absolute;
    right: 38.2%;
    width: 2px;
    background-color: #f00;
}

.red.top {
    height: 23.6%;
    top: 0;
}

.red.bottom {
    height: 38.2%;
    bottom: 0;
}

.green {
    position: absolute;
    right: 50%;
    width: 2px;
    background-color: #83f92c;
    border-color: #83f92c;
}

.green.top {
    height: 14.6%;
    top: 23.6%;
}

.green.bottom {
    height: 23.6%;
    bottom: 38.2%;
}

.arrow:before,
.arrow:after {
    content: '';
    position: absolute;
    display: block;
    left: 0;
    width: 0;
    height: 0;
    margin-left: -6px;
    border-right:  7px solid transparent;
    border-left:   7px solid transparent;
}

.arrow:before {top: 0;}
.arrow:after {bottom: 0;}

.blue:before {border-bottom: 10px solid #00f;}
.red:before  {border-bottom: 10px solid #f00;}
.green:before {border-bottom: 10px solid #83f92c;}

.blue:after {border-top: 10px solid #00f;}
.red:after  {border-top: 10px solid #f00;}
.green:after {border-top: 10px solid #83f92c;}