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.ribbon-wrapper-green {
  width: 105px;
  height: 105px;
  overflow: hidden;
  position: absolute;
  top: -3px;
  right: -3px;
  /*border: 1px solid black;*/
}

.ribbon-green {
  font: 12px Sans-Serif;
  color: #333;
  text-align: center;
  text-shadow: rgba(255,255,255,0.5) 0px 1px 0px;
  -webkit-transform: rotate(45deg);
  -moz-transform:    rotate(45deg);
  -ms-transform:     rotate(45deg);
  -o-transform:      rotate(45deg);
  position: relative;
  padding: 10px 0;
  left: -5px;
  top: 16px;
  width: 150px;
  background-color: #BFDC7A;
  background-image: -webkit-gradient(linear, left top, left bottom, from(#BFDC7A), to(#8EBF45)); 
  background-image: -webkit-linear-gradient(top, #BFDC7A, #8EBF45); 
  background-image:    -moz-linear-gradient(top, #BFDC7A, #8EBF45); 
  background-image:     -ms-linear-gradient(top, #BFDC7A, #8EBF45); 
  background-image:      -o-linear-gradient(top, #BFDC7A, #8EBF45); 
  color: #6a6340;
  -webkit-box-shadow: 0px 0px 3px rgba(0,0,0,0.3);
  -moz-box-shadow:    0px 0px 3px rgba(0,0,0,0.3);
  box-shadow:         0px 0px 3px rgba(0,0,0,0.3);
}

.ribbon-green:before, .ribbon-green:after {
  content: "";
  border-top:   3px solid #6e8900;   
  border-left:  3px solid transparent;
  border-right: 3px solid transparent;
  position:absolute;
  bottom: -3px;
}

.ribbon-green:before {
  left: 0;
}
.ribbon-green:after {
  right: 0;
}

.ribbon-green a{
  text-decoration:none;
  color: #333;
}

<div class="wrapper">
  <div class="ribbon-wrapper-green">
    <div class="ribbon-green"><a href="https://play.google.com/store/apps/details?id=com.gti.tableros">Tableros GTI</a></div>
  </div>
  <div id="Footer">
  <p>Corner bar, Code taken from: <a href="https://css-tricks.com/snippets/css/corner-ribbon/">CSS-Tricks</a></p>
    <p><p>
</div>
</div>