JSFiddle - React, Tailwind, and code Playground

by Gwyn Milcote

HTML

<b>Budgie terminology and things to know</b>
<link rel="stylesheet"  href="https://fonts.googleapis.com/css?family=Cabin">
<p>
<ul>
    <li>'Heterozygous' and 'homozygous' aren't often used. Instead the term 'factor' is used for single or double doses, when a gene is incompletely dominant. For example, a bird with a single copy of -- may be called "SF pied" (single factor) while one with two copies, and a deeper colour, is "DF pied" (double factor).</li>
    <li>A bird that's heterozygous, carrying two different alleles in a locus, is often called 'split'. For example, a green bird that's carrying a single recessive blue allele may be called "Light Green split for blue". It can be shortened with a slash: Light Green/blue" or "Greywing/dilute".</li>
    <li>Melanin includes both black and blue pigments. Mutations that remove melanin (such as ino, pied) will remove both black and blue.</li>
    <li>The face and neck are called the 'mask'. It's usually a different colour (yellow or white) than the body below it (green or blue).</li>
</ul>
</p>
Thanks to the following info sources:
<ul>
    <li><a href='https://puppiesareprozac.com/budgie-parakeet/colors-varieties-mutations-genetics'>PuppiesAreProzac</a></li>
    <li><a href='http://uk-budgie-breeders.blogspot.com/'>UK Budgie Breeders</a></li>
    <li><a href='http://feistyhome.phpwebhosting.com/mutations.htm'>Feisty Feathers</a></li>
    <li><a href='https://www.budgie-info.com/spangle-budgie.html'>Budgie Info</a></li>
    <li><a href='http://kmbreeding.weebly.com/budgie-mutations.html'>K & M Breeding</a></li>
    <li><a href='http://budgiebreeder.synthasite.com/lacewings.php'>Budgie Breeder</a></li>
    <li><a href='http://www.rarebudgerigarclub.org.au/rares.htm'>Rare Budgerigar Club</a></li>
    <li><a href='http://www.wabudgerigarcouncil.com/pics-2004-national-winners.htm'>Western Australia Budgerigar Council</a></li>
</ul>
Some photos were borrowed from those, others found while googling. I'll try to add links...

CSS

img, div, button {
    box-sizing: border-box;
}

html, body {
    color: rgba(0, 0, 0, 0.7);
    font-family: 'Cabin', sans-serif;
}

.hidden, .hoverbox {
	display: none;
}

.round {
    border-radius: 5px;
    background-clip: padding-box;
}

.flex {
    display: flex;
    flex-flow: row wrap;
}
.between {
    justify-content: space-between;
}


.section {
	margin: 10px auto;
	box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.5);
	background-color: #fff;
    overflow: hidden;
}

.section .title {
	font-size: 25px;
    padding: 15px;
    cursor: pointer;
}

.section .content {
    padding: 15px;
}

.section .alleles {
	padding: 10px;
    min-width: 30%; /* Up to 3 loci in a line */
	display: flex;
	justify-content: center;
    align-items: center;
	background-color: #fff;
	font-size: 20px;
}

.section .alleles .allele {
	padding: 10px;
    background-color: rgba(255, 255, 255, 0.2);
	margin: 0px 10px;
	cursor: pointer;
	transition: 0.3s;
}

.section .alleles .allele:hover {
	background-color: rgba(255, 255, 255, 0.4);
	transition: 0.3s;
}

.section .images {
	margin: 10px auto;
	display: flex;
    flex-flow: row wrap;
	justify-content: space-evenly;
}

.section .image {
	text-align: center;
    /*width: 150px;*/
    margin: 5px;
}

.section .image img {
	height: 150px;
    width: auto;
	max-width: 250px;
    border-radius: 5px;
}

#locus_choc .title, #locus_choc .alleles {
    background-color: #996759;
    background-image: linear-gradient(to right, #7A5136, #A87B5C);
}
#locus_di .title, #locus_di .alleles {
    background-color: #EBD19F;
    background-image: linear-gradient(to right, #E6C283, #FAE7C5);
}
#locus_bl .title, #locus_bl .alleles {
    background-color: #9EA5B8;
    background-image: linear-gradient(to right, #717282, #C5C6D4);
}
#locus_mh .title, #locus_mh .alleles {
    background-color: #CF614B;
    background-image: linear-gradient(to right, #963B1C, #E3744F);
}
#locus_lav .title, #locus_lav .alleles {
    background-color: #E0D8E8;
   ...

JavaScript

$(".section .title").click(function(){
    var locus = $(this).data("locus");
    $("#locus_" + locus + " .content").toggleClass("hidden");
});