.custom-button .ba-btn-transition { position: relative; } .custom-button .ba-btn-transition:before { content: ""; border: 20px solid transparent; border-left: 20px solid #333; box-sizing: border-box; height: 20px; left: -20px; position: absolute; width: 20px; transition: .3s; opacity: 0; } .custom-button .ba-btn-transition:hover:before { opacity: 1; }
border-left: 20px solid #333;