Edit in JSFiddle


              
<div class="urun">
    <img src="http://www.placehold.it/280x170" alt="www.anarsamadov.net">
    <div class="kurdele-alani">
        <div class="kurdele">%5 İndirim</div>
    </div>
</div>
.urun {
    margin: 50px auto;
    width: 280px;
    height: 170px;
    background: #DDD;
    -webkit-box-shadow: 0px 0px 8px rgba(0, 0, 0, 0.3);
    -moz-box-shadow: 0px 0px 8px rgba(0, 0, 0, 0.3);
    box-shadow: 0px 0px 8px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 90;
}
.kurdele-alani {
    width: 85px;
    height: 88px;
    overflow: hidden;
    position: absolute;
    top: -3px;
    right: -3px;
}
.kurdele {
    font: bold 13px Sans-Serif;
    color: #000;
    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: 7px 0;
    left: -5px;
    top: 15px;
    width: 120px;
    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);
    
    -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);
}
.kurdele:before, .kurdele:after {
    content:"";
    border-top: 3px solid #6e8900;
    border-left: 3px solid transparent;
    border-right: 3px solid transparent;
    position:absolute;
    bottom: -3px;
}
.kurdele:before {
    left: 0;
}
.kurdele:after {
    right: 0;
}
​