style.css

/* Table of Contents by igniel.com */
.toc {background-color:#f8f9fa; border:1px solid #a2a9b1; padding:10px 13px; display:table; line-height:1.6em;}
.toc h2 {display:inline-block; margin-right:10px}
.toc a {text-decoration:none}
.toc a:hover {text-decoration:underline}
.toc ul {list-style-type:none; list-style-image:none; margin:0px; padding:0px; text-align:left}
.toc ul li {list-style-type:none;}
.toc ul li a {margin-left:.5em}
.toc ul li ul {margin-left:2em}
.toctogglelabel {cursor:pointer; color:#0645ad}
:not(:checked) > .toctoggle {display:inline !important; position:absolute;  opacity:0}
:not(:checked) > .toctogglespan:before {content:'['}
.toctoggle:not(:checked) + .toctitle .toctogglelabel:after {content:'sembunyikan';display: inline}
.toctoggle:checked + .toctitle .toctogglelabel:after {content:'tampilkan'}
:not(:checked) > .toctogglespan:after {content:']'}
.toctoggle:checked ~ ul{display:none}
:target::before {content:''; display:block; height:0px; margin-top:0px; visibility:hidden}

/* Membuat garis di HTML CSS by https://sko.dev/snippet/cara-membuat-garis-di-html-css */
hr {
    border: none;
    height: 1px;
    color: #333; 
    background-color: #333;
}