JSFiddle - React, Tailwind, and code Playground

HTML

<div class="count-unit">
    <div class="count-digit digit0"></div>
    <div class="count-digit digit6"></div>
</div>
<div class="count-unit">
    <div class="count-digit digit0"></div>
    <div class="count-digit digit4"></div>
</div>
<div class="count-unit">
    <div class="count-digit digit4"></div>
    <div class="count-digit digit2"></div>
</div>
<div class="count-unit">
    <div class="count-digit digit3"></div>
    <div class="count-digit digit9"></div>
</div>

CSS

div {
    min-height: 1.6em;
    min-width: 1em;
    border: 1px solid #ccc;
}

.count-unit {
    margin-left: 20px;
    padding: 5px;
    float: left;
}

.count-digit { 
    float: left;
    height: 44px;
    width: 30px
} 

.digit0 { 
    background-color: #00f;
} 
.digit2 { 
    background-color: #0ff;
} 
.digit3 { 
    background-color: #0f0;
} 
.digit4 { 
    background-color: #ff0;
} 
.digit6 { 
    background-color: #f00;
} 
.digit9 { 
    background-color: #f0f;
}