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<div id="arrow">arrow</div>
#arrow {
width: 100px;
height: 30px;
background: #ec8b46;
position: relative;
}
#arrow:after {
content: ' ';
width: 0;
height: 0;
border-top: 15px solid transparent;
border-bottom: 15px solid transparent;
border-left: 15px solid #ec8b46;
position: absolute;
left: 100px;
}