#sectionsNav::after{filter:blur(50px)} #sectionsNav::before,#sectionsNav::after{content:'';position:absolute;left:-2px;bottom:-2px;background:linear-gradient(45deg,#fb0094,#0000ff,#00ff00,#ffff00,#ff0000,#fb0094,#0000ff,#00ff00,#ffff00,#ff0000);background-size:auto;background-size:200%;margin-left:-15px;width:calc(99% + 30px);height:2px;animation:steam 20s linear infinite}