CSS Triangles

css-triangles

HTML:
<div class="arrow-up"></div>
<div class="arrow-down"></div>
<div class="arrow-left"></div>
<div class="arrow-right"></div>

CSS:
.arrow-up {
width: 0; 
height: 0; 
border-left: 5px solid transparent;
border-right: 5px solid transparent;
border-bottom: 5px solid black;
}

.arrow-down {
width: 0; 
height: 0; 
border-left: 5px solid transparent;
border-right: 5px solid transparent;
border-top: 5px solid #f00;
}

.arrow-right {
width: 0; 
height: 0; 
border-top: 5px solid transparent;
border-bottom: 5px solid transparent;
border-left: 5px solid green;
}

.arrow-left {
width: 0; 
height: 0; 
border-top: 5px solid transparent;
border-bottom: 5px solid transparent; 
border-right: 5px solid blue; 
}