How to rotate pseudo element css - css

Question

I want to recreate this icon using css pseudo elements (as a toggle indicator):
I have created the nececcary pseudo elements using ::after, ::before and tried to rotate them using transform: rotate(90deg).
How can I tell them to rotate around their own center? I have tried transform-origin: 50% 50%; which does not work. Right now, both pseudo elements got the same right: 10px; but they are not placed above each other, instead they are next to each other.
You can check this JS FIDDLE to illustrate the problem.

Answer 1

First you can use :before and :after pseudo elements and create shape like this DEMO
After that you can rotate parent element for 45deg and get desired result.
.el {
margin: 50px;
position: relative;
transform: rotate(45deg);
display: inline-block;
}
.el:before,
.el:after {
content: '';
width: 30px;
height: 30px;
position: absolute;
}
.el:before {
border-top: 4px solid black;
border-left: 4px solid black;
top: -10px;
left: -10px;
}
.el:after {
border-bottom: 4px solid black;
border-right: 4px solid black;
top: 10px;
left: 10px;
}
<div class="el"></div>
Update: You can also add some transition on :hover like this
.el {
margin: 50px;
position: relative;
transform: rotate(45deg);
display: inline-block;
cursor: pointer;
}
.el:before,
.el:after {
content: '';
width: 30px;
height: 30px;
position: absolute;
transition: all 0.3s ease-in;
}
.el:before {
border-top: 4px solid black;
border-left: 4px solid black;
top: -10px;
left: -10px;
}
.el:after {
border-bottom: 4px solid black;
border-right: 4px solid black;
top: 10px;
left: 10px;
}
.el:hover:before {
top: -15px;
left: -15px;
}
.el:hover:after {
top: 15px;
left: 15px;
}
<div class="el"></div>

Answer 2

transform-origin works fine, it's just that
a) 50% 50% (the object's center) is the default, and
b) you have to center the content of the box. That's a bit tricky because the icon you use doesn't require the full line height. Try adding
::before, ::after {
padding-bottom: .17em;
}

Answer 3

modify the style of #pseudo::after as right: 0;
#div {
background: blue;
width: 80px;
height: 80px;
transform: rotate(45deg);
}
/* tested but not working */
#pseudo::after,
#pseudo::before {
/* transform-origin: 50% 50%; */
}
#pseudo::after {
content: '›';
font-size: 50px;
color: green;
right: 0;
position: absolute;
transform: rotate(90deg);
top: 40px;
}
#pseudo::before {
content: '›';
font-size: 50px;
position: absolute;
color: green;
right: 10px;
top: 10px;
transform: rotate(-90deg);
}
<div id="div"></div>
<div id="pseudo"></div>