.timeline{ margin-top:20px; position:relative; }.timeline:before{ position:absolute; content:''; width:4px; height:calc(100% + 50px);background: rgb(138,145,150);background: -moz-linear-gradient(left, rgba(138,145,150,1) 0%, rgba(122,130,136,1) 60%, rgba(98,105,109,1) 100%);background: -webkit-linear-gradient(left, rgba(138,145,150,1) 0%,rgba(122,130,136,1) 60%,rgba(98,105,109,1) 100%);background: linear-gradient(to right, rgba(138,145,1