JSFiddle - React, Tailwind, and code Playground

by Gwyn Milcote

HTML

corn snake gene list
<link rel="stylesheet"  href="https://fonts.googleapis.com/css?family=Cabin">

<div class='section round' id='locus_a'>
    <div class='title' data-locus='a'>a (a locus)</div>
    <div class='content hidden'>
    <div class='images'>
	    
        <div class='image'>
		    <img src='a' loading='lazy' alt='description'>
			<br>a
		</div>
        <div class='image'>
		    <img src='a' loading='lazy' alt='description'>
			<br>a
		</div>
		<div class='image'>
		    <img src='a' loading='lazy' alt='description'>
			<br>a
		</div>
		<div class='image'>
		    <img src='a' loading='lazy' alt='description'>
			<br>a
		</div>
		<div class='image'>
		    <img src='a' loading='lazy' alt='description'>
			<br>a
		</div>
		
	</div>
    <p>aaa</p>
	<div class='alleles round'>
	
	    <div class='allele round hoverable'>
		    a
		    <div class='hoverbox'>
			Dominant mutation. a
			</div>
		</div>
         > 
		<div class='allele round hoverable'>
		    a+
		    <div class='hoverbox'>
			Recessive wildtype. No effect.
			</div>
		</div>
		
	</div>
    <p><b>Inheritance:</b> a is a dominant mutation, meaning the snake only needs to inherit 1 copy to express it. It makes no visual difference if 2 copies are carried.</p>
    </div>
</div>

<div class='section round' id='locus_choc'>
    <div class='title' data-locus='choc'>Chocolate (Choc locus)</div>
    <div class='content hidden'>
	<div class='images'>
	    
		<div class='image'>
		    <img src='https://www.poultryshowcentral.com/images/chocolate-orpington-bantam-cockerel-matt-hanson.jpg' loading='lazy' alt='description'>
			<br>Chocolate Orpington Bantam
		</div>
		<div class='image'>
		    <img src='https://i.pinimg.com/originals/a8/65/8d/a8658d2ba2563a34236b1a29e118d934.jpg' loading='lazy' alt='description'>
			<br>Chocolate Cuckoo Orpingtons
		</div>
		<div class='image'>
		    <img src='https://i.pinimg.com/originals/65/27/cd/6527cd548bfff1b5708d5ba51816b668.jpg' loading='lazy'...

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");
});