CSS after selector as clamp effect over image - css

Question

I've try to made in CSS a "clamp effect".
See image:
https://s27.postimg.org/j6m72z5kj/h_transylvania.png
I do not know exactly how this effect is named, so I called him "clamp effect".
Can someone tell me why ::after does not working?(to can have that "clamp effect" - see link with the image).
My code:
h2 {
margin-top: 40px;
}
.container {
background-color: #fff;
width: 250px;
height: auto;
padding: 20px;
}
img.mypicture {
width: 230px;
}
.recomandded {
position: absolute;
display: inline-block;
top: 125px;
left: 1px;
color: #fff;
background-color: #ff0047;
font-size: 13px;
font-weight: 700;
font-family: Lato,Arial,sans-serif;
padding: 3px 16px 3px 6px;
border-radius: 4px 0 0 4px;
box-shadow: 1px 2px 2px 0 rgba(0,0,0,0.4);
}
.recomandded::after {
content: "";
display: inline-block;
border: 6px solid #dd0843;
border-bottom-color: transparent;
border-right-color: transparent;
position: absolute;
top: 29px;
left: 0;
}
<div class="container">
<h2>Beautiful Flower</h2>
<img class="mypicture" src="https://upload.wikimedia.org/wikipedia/commons/f/fe/Frangipani_flowers.jpg" />
<div class="recomandded">RECOMMENDED</div>
</div>

Answer 1

An absolute element will relate to it's parent only if it's in non static, default, position, therefore I've added position: relative to the container, in the example.
I've also fixed the required definitions to match the provided example image.
Here is the fixed CSS:
h2 {
margin-top: 40px;
}
.container {
position: relative;
background-color: #fff;
width: 250px;
height: auto;
padding: 20px;
}
img.mypicture {
width: 230px;
}
.recomandded {
position: absolute;
display: inline-block;
top: 125px;
left: 8px;
color: #fff;
background-color: #ff0047;
font-size: 13px;
font-weight: 700;
font-family: Lato,Arial,sans-serif;
padding: 3px 16px 3px 6px;
border-radius: 4px 0 0 4px;
box-shadow: 1px 2px 2px 0 rgba(0,0,0,0.4);
}
.recomandded::after {
content: "";
display: inline-block;
border: 6px solid #dd0843;
border-bottom-color: transparent;
border-left-color: transparent;
position: absolute;
top: 20px;
left: 0;
}
Or have yourself a fiddle example
Hope it helps