border绘制与color变色钮

HTML

<a href class="add" title="继续上传">
  添加图片
</a>
					    

CSS

.add {
    display: inline-block;
    width: 76px; height: 76px;
    color: #ccc;
    border: 2px dashed;
    text-indent: -12em;
    transition: color .25s;
    position: relative;
    overflow: hidden;
}
.add:hover {
    color: #34538b;
}
.add::before, .add::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
}
.add::before {
    width: 20px;
    border-top: 4px solid;
    margin: -2px 0 0 -10px;
}
.add::after {
    height: 20px;
    border-left: 4px solid;
    margin: -10px 0 0 -2px;
}

					    

JS

//no