.ribbon-2 {
    --f: 10px; /* control the folded part*/
    --r: 15px; /* control the ribbon shape */
    --t: 10px; /* the top offset */
    margin-right: 2.4%;
    position: absolute;
    inset: var(--t) calc(-1*var(--f)) auto auto;
    padding: 0 10px var(--f) calc(10px + var(--r));
    clip-path: 
      polygon(0 0,100% 0,100% calc(100% - var(--f)),calc(100% - var(--f)) 100%,
        calc(100% - var(--f)) calc(100% - var(--f)),0 calc(100% - var(--f)),
        var(--r) calc(50% - var(--f)/2));
    background: #d2042d;
    color: white;
    box-shadow: 0 calc(-1*var(--f)) 0 inset #0005;
    
    @media (min-width: 576px) { 
     
     margin-right: -10px;
     }x
    
  }


.container01 {
  --d: 6px; /* folded part */
  --c: blue; /* color */
  --f: 16px; /* ribbon font-size */

  max-width: 768px; 
  max-height: 400px;
  position: relative;
  display: inline-block;
  margin: 20px;
  background: lightblue;
}

.container01::before {
  content: attr(data-ribbon);
  position: absolute;
  font-size: var(--f);
  top: 0;
  right: 0;
  transform: translate(29.29%, -100%) rotate(45deg);
  color: #fff;
  text-align: center;
  border: 1px solid transparent;
  border-bottom: 0;
  transform-origin: bottom left;
  padding: 5px 35px calc(var(--d) + 5px);
  background: linear-gradient(rgba(0, 0, 0, 0.5) 0 0) bottom/100% var(--d)
    no-repeat var(--c);
  background-clip: padding-box;
  clip-path: polygon(0 0,100% 0,100% 100%,calc(100% - var(--d)) calc(100% - var(--d)),var(--d) calc(100% - var(--d)),0 100%);
  -webkit-mask: linear-gradient(135deg,transparent calc(50% - var(--d) * 0.707),#fff 0) bottom left,
    linear-gradient(-135deg, transparent calc(50% - var(--d) * 0.707), #fff 0)bottom right;
  -webkit-mask-size: 300vmax 300vmax;
  -webkit-mask-composite: destination-in;
  mask-composite: intersect;
}
.left::before {
  left: 0;
  right: auto;
  transform: translate(-29.29%, -100%) rotate(-45deg);
  transform-origin: bottom right;
}