html:
<div class="arrow-down"></div> <div class="arrow-up"></div> <div class="arrow-left"></div> <div class="arrow-right"></div>
css:
.arrow-up {
width: 0;
height: 0;
border: 5px solid transparent;
border-bottom: 5px solid black;
}
.arrow-down {
width: 0;
height: 0;
border: 20px solid transparent;
border-top: 20px solid #f00;
}
.arrow-right {
width: 0;
height: 0;
border: 60px solid transparent;
border-left: 60px solid green;
}
.arrow-left {
width: 0;
height: 0;
border: 10px solid transparent;
border-right: 10px solid blue;
}