JSFiddle - React, Tailwind, and code Playground

HTML

<a href="schedule.html#0906" class="accordion-link">2018.09.06</a>(木) 今池GROW<br><br>


    <button class="accordion" id="0906">2018/09/06(木)今池GROW </button>
    <div class="panel">
    <p>
    Testing
    </p>
    </div>

CSS

@charset "utf-8";
/* CSS Document */

 /* Style the buttons that are used to open and close the accordion panel */
button.accordion {
    background-color: #530010;
    color: #FFF;
	font-weight: bolder;
    cursor: pointer;
    padding: 10px;
    width: 100%;
    text-align: left;
    border: none;
    outline: none;
    transition: 0.4s;
	border-radius: 5px;
}

/* Add a background color to the button if it is clicked on (add the .active class with JS), and when you move the mouse over it (hover) */
button.accordion.active, button.accordion:hover {
    background-color: #a20121;
}

/* Style the accordion panel. Note: hidden by default */
div.panel {
    padding: 0px 5px;    
	margin-bottom: 5px;
	background-color: #none;
    max-height: 0px;
    overflow: hidden;
    transition: max-height 0.2s ease-out;
}

button.accordion:after {
    content: '\02795'; /* Unicode character for "plus" sign (+) */
    font-size: 13px;
    color: #fff;
	font-weight: bolder;
    float: right;
    margin-left: 5px;
}

button.accordion.active:after {
    content: "\2796"; /* Unicode character for "minus" sign (-) */
}

JavaScript

var acc = document.getElementsByClassName("accordion");
    var i;

    for (i = 0; i < acc.length; i++) {
      acc[i].onclick = function() {
        this.classList.toggle("active");
        var panel = this.nextElementSibling;
        if (panel.style.maxHeight){
          panel.style.maxHeight = null;
        } else {
          panel.style.maxHeight = panel.scrollHeight + "px";
        }
      }
    }

    // get list of links by class
    var links = document.getElementsByClassName("accordion-link");

    var linksLength = links.length;
    for(var i=0; i < linksLength; i++){
      links[i].onclick = function(e){
        // preventDefault is probably optional
        // depending on your application
        e.preventDefault();

        // isolate the hash
        var hash = e.path[0].hash;

        // remove # from hash
        hash = hash.substring(1, hash.length);

        // select by id using hash
        document.getElementById(hash).click();
      }
    }