/*Etiquette avec pseudo élement  #658E15 */
#bloc {  position: relative;}
#bloc:before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  border-width: 0 20px 20px 0;
  border-style: solid;
  border-color: #658E15 #fff;
}
/*Ruban avec pseudo element by Naoya*/
.box{    position: relative;
 }

/*.box{
  width: 500px;
  height: 300px;
  margin:  0 auto;
  background-color: #ccc;
  position: relative;
  border: 4px solid #333;
}*/
.ruban {
  width: 150px;
  height: 150px;
  overflow: hidden;
  position: absolute;
}
.ruban::before,
.ruban::after {
  position: absolute;
  z-index: -1;
  content: '';
  display: block;
  border: 5px solid #000;
}

.ruban span {
  position: absolute;
  display: block;
  width: 225px;
  padding: 15px 0px;
  background-color: #531c0d;
  opacity: 0.5;
  box-shadow: 0 5px 10px rgba(0,0,0,.1);
  color: #fff;
  text-align: center;
}
/*   -10px; }*/
.left {  top: 0;  right: 0;}
.left::before {  top:  0;  left: 0;}
.left::after {  bottom: 0;  right: 0;}
/*   right: -25px;   top: 30px; }*/
.left span {  left: -20px;  top: 25px;  transform: rotate(45deg);}