JSFiddle - React, Tailwind, and code Playground

HTML

<div class="picture">

    <div class="ribbon ribbon-top-left">
      <span>TEXT</span>
    </div>

    <img src="http://i.imgur.com/5lWqOGT.png" />
    
</div>

CSS

body {
  margin: 10px;
}

img {
  border-radius: 0.5vw;
  height: 60vh;
  /* width:100%; */
}

.picture {
  position: relative;
  width:100%;
}

.ribbon {
  position: absolute;
  left: -5px; top: -5px;
  z-index: 1;
  overflow: hidden;
  width: 100%; 
  height: 100%;
  text-align: right;
}
.ribbon span {
  font-size: 3vh;
  font-weight: bold;
  color: #FFF;
  text-transform: uppercase;
  text-align: center;
  line-height: 4vh;
  transform: rotate(-45deg);
  -webkit-transform: rotate(-45deg);
  width: 30vh;
  display: block;
  background: #79A70A;
  background: linear-gradient(#9BC90D 0%, #79A70A 100%);
  box-shadow: 0 3px 10px -5px rgba(0, 0, 0, 1);
  position: absolute;
  top: 7.4vh;
  left: -5.6vh;
}
.ribbon span::before {
  content: "";
  position: absolute; left: 0px; top: 100%;
  z-index: -1;
  border-left: 3px solid #79A70A;
  border-right: 3px solid transparent;
  border-bottom: 3px solid transparent;
  border-top: 3px solid #79A70A;
}
.ribbon span::after {
  content: "";
  position: absolute; right: 0px; top: 100%;
  z-index: -1;
  border-left: 3px solid transparent;
  border-right: 3px solid #79A70A;
  border-bottom: 3px solid transparent;
  border-top: 3px solid #79A70A;
}