html - CSS - Triangle down -

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this question has answer here:

how create arrow down (triangle) when hovering on link?

something result tab on codepen, see here

i trying create triangle following the tutorial above, no luck

 a{   background: red;     float: left;     width: 30%;     padding: 5px;     display block   }    a:hover {background: green;}

i'm not sure mean, answer:

css:

.arrow_down_on_hover{   position: relative; } .arrow_down_on_hover:before{   content: "";   width: 0;    height: 0;    border-left: 20px solid transparent;   border-right: 20px solid transparent;   display: none;   border-top: 20px solid #f00;   position: absolute;   right: 50%;   margin-right: -10px;   bottom: -20px; } .arrow_down_on_hover:hover:before{   display: block; }

html:

<a class="arrow_down_on_hover" href="#!">hover me</a>

example:

http://codepen.io/eboye/pen/zbyzav


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