Triangle overlay in right corner css

Question

I want to create an overlay with css over one image like this:

but I only do a square overlay like this:

how I can make the first shape with css ??

here is my code:

.card-img-overlay {
position: absolute;
top: 0px;
right: 0px;
bottom: 0;
left: 150px;
padding: 1.25rem;
}

thank you for your answers :)

Answer 1

Check this out

#triangle-topleft {
  width: 0;
  height: 0;
  border-top: 100px solid #9020d1bb;
  border-left: 100px solid transparent;
  position: absolute;
}

#container {
  position: relative;
}

#container #triangle-topleft,
#overlay {
  position: absolute;
  color: white;
  right: 0;
}

<div id="container">
  <div id="triangle-topleft"></div>
  <div id="overlay">Microsoft</div>
</div>

Answer 2

I will go with a simple gradient and no need for any extra markup or the use of pseudo element:

body {
  height: 100vh;
  margin: 0;
  background: 
  linear-gradient(to top right, transparent 50%, rgba(255, 0, 0, 0.5) 51%) 0 0/100% 200px no-repeat, 
  url(https://lorempixel.com/1000/1000/) center/cover;
}
div {
 height:200px;
 text-align:right;
 color:#fff;
 padding:10px;
 font-size:25px;
}

<div>
  <p>Some content</p>
</div>