.env{display:none;position:absolute;left:50px;top:10px;width:70px;height:70px;line-height:70px;border-radius:50%;z-index:9999;text-align:center;text-transform:uppercase;font-family:Arial;font-size:16px;font-weight:700;color:#fff}.env:hover{opacity:0}.env.dev{display:block;background-color:green}.env.int{display:block;background-color:purple}.env.valid{display:block;background-color:#00f}