jQuery addClass example
Change class name on click in jQuery
HTML
<div class="box">
<div class="triangle"></div>
</div>
SCSS
.box {
display: inline-block;
background: #ccc;
}
.triangle {
width: 0px;
height: 0px;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-bottom: 50px solid black;
}