Why don't my :active' or :checked selectors work? - html

Question

I have a hidden sidebar menu on my website, if I open my website on my desktop, my hidden sidebar has 100px width (not full), so to reveal it all you must do is hover over it. If I open my website on a mobile device, my hidden sidebar has no width, and I must click the button to reveal the sidebar.
HTML:
<div id="mySidenav" class="sidenav sidenav-wrapper">
<img class="logo1" src="../img/logo1.png"><br><br>
Home
About
Contact
</div>
<div id="contoh" class="content-section-b">
<div class="mobiletoggle">
<label class="fa fa-bars" for="showblock"></label>
<input type="checkbox" id="showblock" />
</div>
</div>
In the code above I use checkbox to change 'click', because I just want to use CSS.
CSS:
.sidenav {
height: 100%;
width: 100px;
position: fixed;
z-index: 1;
top: 0;
left: 0;
background-color: #111;
overflow-x: hidden;
padding-top: 60px;
transition: 0.8s;
}
.logo1 {
height: 10%;
width: auto;
padding-left: 20px;
transition: 0.8s;
}
.sidenav:hover {
width: 250px;
transition: 0.8s;
}
.sidenav:hover ~ #contoh {
background-color: rgba(0,0,0,0.4);
filter: grayscale(100%);
}
.sidenav:hover .logo1 {
height: auto;
width: 95%;
padding-left: 10px;
transition: 0.8s;
}
.sidenav a {
float:left;
width:100%;
padding: 8px 8px 8px 32px;
text-decoration: none;
font-size: 20px;
color: #818181;
display: block;
opacity: 0;
transition: opacity 1300ms
}
.sidenav a:hover, .offcanvas a:focus {
color: #f1f1f1;
background-color:#5fa2db;
font-size: 30px;
}
#showblock {
display: none;
}
#media screen and (min-width:768px) {
.mobiletoggle {
display:none;
}
}
#media screen and (max-width:767px) {
.sidenav {
width:0px;
}
#showblock:checked + .sidenav {
width: 250px;
transition: 0.8s;
}
}
In the code above I used :checked, it's just a little bit different if I use :active. The problem is why my :checked/:active did not work? I looked into this jsFiddle, and it works fine, so why can't I use it? Any suggestions?

Answer 1

As per your CSS, modify your HTML to:
<input type="checkbox" id="showblock">
<div id="mySidenav" class="sidenav sidenav-wrapper">
<img class="logo1" src="../img/logo1.png"><br><br>
Home
About
Contact
</div>
<div id ="contoh" class="content-section-b">
<div class="mobiletoggle">
<label class="fa fa-bars" for="showblock"></label>
</div>
</div>
The input #showblock should be above the div #mySidenav in order for your CSS to work.
#showblock:checked + .sidenav {
width: 250px;
transition: 0.8s;
}